Most plant tissues die if their water content falls too low: the nutrients that feed plants are
transmitted by water; water is a raw material in the vital process of photosynthesis; and
water regulates the temperature of a plant by its ability to absorb heat and because water
vapor lost to the atmosphere through the leaves helps to lower plant temperatures. (A) Water
controls the volume of plant matter produces. (B) The distribution of plants within different
areas of desert is also controlled by water. (C) Some areas, because of their soil texture,
topographical position, or distance from rivers or groundwater, have virtually no water
available to plants, whereas others do. (D)
For this reason, the total amount of plant material in a desert is often 100 times less than
the amount of plant material in an equivalent area of temperate forest.
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답은 (C) 입니다만, (D)는 답이 될 수 없는 이유가 whereas others do 때문이라고 보면 될까요?