Hint: Small size of the cell provides it easy to carry metabolic movement similar to the movement of things that takes place from smaller utensils and the nucleus can also Control the cytoplasmic processes in a good manner is performed by small size. Cells are so little in size so that they can maximize their ratio of area to volume.
Surface area to volume ratio, is simply defined as the size of surface area to the volume of substance that can pass through it at a particular time. Amoeba and some bacteria are flat and they show a large surface area to volume ratio.
Whereas humans show a small surface area volume so diffusion occurs very slow or does not take place at all.
When the cell increases in size, the volume gets faster than the surface area, because the volume is cubed where surface area is squared.
For a single-celled organism, say unicellular organism (or a cell in a multicellular organism's body, for that matter), the surface is a critical interface between the organism. Changes in the surface area to volume ratio have important influences for limits or constraints on organism size and help explain some of the modifications seen in larger-bodied organisms.
Exchange of materials often takes place through the process of diffusion, in which dissolved molecules or other particles move from areas of higher Concentration to areas of lower concentration (although some exchange is mediated by cellular mechanisms). This kind of exchange is termed as a passive process, and as a result, imposes constraints upon the size of a single-celled organism or cell. Materials must be able to go to all parts of a cell quickly, and when the volume is too large relative to the surface area, diffusion cannot occur at sufficiently high rates to make sure this.
Organisms show a variety of modifications, both physiological and anatomical, to compensate for changes in the surface area to volume ratio associated with size differences.
This is the reason why cells divide. When they become too large and it takes too long for them to move materials across the cell, they lose efficiency and divide in half to raise the surface area to volume ratio.
Hence, the correct answer is option (C)
Note: One example of this kind of process is the higher metabolic rates found in smaller (homeothermic) animals. Because of the presence of their large surface area relative to volume, small animals lose heat at much higher rates than large animals, and therefore must synthesise large amounts of heat.