The effect of the massive growth of population to drinkable water.
The effect of the massive growth of human population to drinkable water is the decrease of water that is needed for survival. Hence, the correct answer is Option D.
Option A is not the correct answer because massive growth of human population does not decrease amount of waste and pollutants in the water supply, rather, massive human growth contribute to it.
Option B is not also the correct answer because the massive growth of human population means that there is a possibility in the decrease of water availability rather than increase of water availability.
Option C could be the answer however Option D is a more direct answer. Decrease in drinkable water is the very first consequence that will be experience. Hence, option C is not the correct answer also.
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