Biological organization starts with
a. Submicroscopic molecular level
b. Cellular level
c. Organismic level
d. Atomic level

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Hint: All living things are made from cells, and the cell is the smallest fundamental unit of structure and performance in living organisms. Organisms are classified as prokaryotic or eukaryotic. Prokaryotes are single-celled or colonial organisms that don't have membrane-bound nuclei; in contrast, the cells of eukaryotes do have membrane-bound organelles and a membrane-bound nucleus.

 Complete answer:
In order to answer this question we need to discuss the level of organization in organisms.
Biological organization is the hierarchy of complex biological structures and systems that outline life employing a reductionist approach. The upper levels of this scheme are often observed as an ecological organization concept, or because the field, hierarchical ecology.
The fundamental principle behind the organization is that the concept of emergence—the properties and functions found at a hierarchical level aren't present and irrelevant at the lower levels.

From Organelles to Biospheres
Macromolecules form aggregates within a cell surrounded by membranes; these are called organelles. Organelles are small structures that exist within cells.
In larger organisms, cells combine to create tissues, which are groups of comparable cells ending similar or related functions. Organs are collections of tissues grouped together performing a standard function. An organ system may be a higher level of organization that consists of functionally related organs. Mammals have many organ systems. As an example, the cardiovascular system transports blood through the body and to and from the lungs; it includes organs like the center and blood vessels. Furthermore, organisms are individual living entities. For instance, each tree in a very forest is an organism. Single-celled prokaryotes and single-celled eukaryotes are considered organisms and are typically spoken as microorganisms.
All the individuals of a species living within a particular area are collectively called a population. For example, all of the trees, flowers, insects, and other populations during a forest form the forest’s community. The forest itself is an ecosystem. An ecosystem consists of all the living things during a particular area along with the abiotic, non-living parts of that environment like nitrogen within the soil or rain water. Biosphere is the collection of all ecosystems, and it represents the zones of life on earth. It includes land, water, and even the atmosphere to a particular extent. Taken together, all of those levels comprise the biological levels of organization, which range from organelles to the biosphere.

The biological organization of life could be a fundamental premise for varied areas of research projects, particularly within the medical sciences. Without this necessary degree of organization, it'd be way more difficult—and likely impossible—to apply the study of the results of varied physical and chemical phenomena to diseases and physiology (body function). for instance, fields like cognitive and behavioral neuroscience couldn't exist if the brain wasn't composed of specific kinds of cells, and also the basic concepts of pharmacology couldn't exist if it had not been known that a change at the cellular level can affect a whole organism. These applications extend into the ecological levels also. For instance, DDT's direct insecticidal effect occurs at the subcellular level, but affects higher levels up to and including multiple ecosystems. Theoretically, a change in one atom could change the complete biosphere.

Therefore, the answer is a. submicroscopic molecular level.

Note: Each level within the hierarchy will be described by its lower levels. Example, the organism could also be described at any of its component levels, including the atomic, molecular, cellular, histological, organ and organ system levels. Furthermore, at every level of the hierarchy, new functions necessary for the control of life appear. These new roles don't seem to be functions that the lower level components are capable of and are thus brought up as emergent properties.
Every organism is organised, though not necessarily to the identical degree. An organism can't be organised at the histological (tissue) level if it's not composed of tissues within the first place.