Question

Primary source of water
A. Rivers
B. Groundwater
C. Lakes
D. Rainwater

Answer 1

Hint: Water resources are natural resources of water from where water can be taken for anthropogenic activities.

Complete answer:
Out of all the sources of water, rainwater is the primary source of water.

Additional information:
> Sources of water can be divided into surface water, ground water, frozen water and desalinated water based on their locations.
> Surface water is water present in the river, lake or freshwater wetland. Surface water is replenished by rain and lost through flowing in the oceans, evaporation, transpiration and groundwater seepage.
> Groundwater is freshwater located in the pore space of soil and rocks in the ground. It is also water that is present within aquifers below the water table. The natural filling of groundwater is through seepage from surface water. The water lost from groundwater is in the form of springs and seepage to the oceans.
> Several plans and propositions have been made to use icebergs as a water source, however to date this has only been done for research purposes as it is a costly process. Glacier runoff is considered to be surface water.
> Desalination is an artificial process by which fresh water is obtained from saline water (generally sea water). The most common desalination processes include distillation and reverse osmosis. Desalination is currently expensive compared to other alternative sources of water, and only a very small portion of total human use is satisfied by desalination.

So, the correct answer is 'Lake' .

Note: Fresh water is a renewable resource, yet the world's supply of fresh water is progressively decreasing due to overuse, overexploitation and pollution of water by anthropogenic activities.