陈向东逻辑-weaken-求助各位NN

appleontree

Noting that the number of crimes committed in a certain city had decreased in 1982 by 5.2% in comparison with 1981, the police chief of the city said, “We see here the result of innovative police program put into effect in the city at the beginning of 1982.”

Which of the following, if true, most seriously weakens the conclusion drawn by the police chief?

A.Several cities that have recently increased spending for police programs experienced no decrease in crime in 1982, as compared with 1981.
B.The number of crimes committed in the city is estimated, by the same method each year, from the number of crimes reported.
C.The number of crimes committed in the suburban areas surrounding the city rose by about 5% in 1982 over the figure for 1981 and were nearly equal in number to those in the city in 1982.
D.The number of crimes committed in the city in 1982 was 10% higher than the number committed in 1972.
E.The size of the age group most likely to commit crimes decreased considerably in the city in 1982, as against 1981, because of a declining birth rate.

答案是E。我明白为什么选择的是E。
我的疑问是为什么A不对，原文指出的是是innovative police program是导致犯罪率下降的原因，那么削弱这个观点就是要说明另有他因，而不是这个项目导致的。那同样是说明program没用，不是它导致的犯罪率下降的A为什么不能说明问题呢？

Fuckitup

A.Several cities that have recently increased spending for police programs experienced no decrease in crime in 1982, as compared with 1981.

First of all, "several cities" are not "the city" in the argument.

Secondly, A) says increased spending DID NOT decrease the crime rate. So this is something that is NOT working.

In a nutshell, A) does not weaken the argument.

Focuse on the conclusion. A) has nothing to do with the stated conclusion.

appleontree

thx for your detailed explanation！