问一道GWD里的CR题 本人菜鸟一个坐等牛人指点

Laurieyy

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.
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为啥选第四个 没明白

sdcar2010

This is a number and percentage question.

In D, it says that the total number of retirees who moved between states has increased significantly.  That is the base or denominator to calculate the number of retirees who moved to florida. Even if the percentage of retirees who moved to Floriday drops by 3%, if the total # of retirees are increasing at a much larger rate, the number of retirees who moved to Florida might still increase.

For example:
In 2000, 1000 people retired. Ten percent of them moved to Florida.  That's 100 people.
In 2010, 10,000 people retired. Seven percent of them moved to Florida.  That's 700 people!

If so, the argument falls apart.

Laurieyy