LSAT-13-4-4【reservoir level】

4. The region’s water authority is responding to the current drought by restricting residential water use. yet reservoir levels are now at the same height they were during the drought ten years ago when no restrictions were put into effect and none proved necessary. Therefore, imposing restriction now is clearly premature.

Which one of the following, if true, most seriously calls the conclusion above into question?

(A) There are now more water storage reservoirs in the region than there were ten years ago.

(B) The population of the region is approximately three times greater than it was ten years ago.

(C) The region currently has more sources outside the drought-stricken area from which to draw water than it did ten years ago.

(D) The water-consuming home appliances and fixtures sold today are designed to use water more efficiently than those sold ten years ago.

(E) The price of water for residential use is significantly higher in the region than it is in regions that are not drought-stricken.

key's B.为什么C和D不能选呢？

c: you have more water sources (not water consumers) outside

d:ten years ago, in this area, maybe few people or nobody had home appliances

why not A?

Since even if the population increased , the number of reservior probably also increased. Then even though the level still keeps the same height, the water reserved is more than it was when there is no restriction. => restriction is effective and necessary.

So both A and B can be the answers.