GWD1-Q13:

In the United States, of the people who moved from one state to another when they retired, the percentage who retired to Florida has decreased by three percentage points over the past ten years.  Since many local businesses in Florida cater to retirees, this decline is likely to have a noticeably negative economic effect on these businesses.

Which of the following, if true, most seriously weakens the argument?

A.      Florida attracts more people who move from one state to another when they retire than does any other state.

B.       The number of people who move out of Florida to accept employment in other states has increased over the past ten years.

C.      There are far more local businesses in Florida that cater to tourists than there are local businesses that cater to retirees.

D.      The total number of people who retired and moved to another state for their retirement has increased significantly over the past ten years.

E.       The number of people who left Florida when they retired to live in another state was greater last year than it was ten years ago.

答案是D

感觉没有答案， 请各位NN帮忙分析一下

谢谢了！

分母与分子的问题.

percentage和number

percentage降低未必意味着绝对的number降低，所以尽管percentage下降了，但是总的去florida的 retirees还是增加了，因此不会影响经济

谢谢楼上几位的分析，有点顿开茅塞了。