GWD 2中的一道题 请教！

Newspaper editorial:  

In an attempt to reduce the crime rate, the governor is getting tough on criminals and making prison conditions harsher.  Part of this effort has been to deny inmates the access they formerly had to college-level courses.  However, this action is clearly counter to the governor’s ultimate goal, since after being released from prison, inmates who had taken such courses committed far fewer crimes overall than other inmates.

Which of the following is an assumption on which the argument depends?

1. Not being able to take college-level courses while in prison is unlikely to deter anyone from a crime that he or she might otherwise have committed.
2. Former inmates are no more likely to commit crimes than are members of the general population.
3. The group of inmates who chose to take college-level courses were not already less likely than other inmates to commit crimes after being released. 
4. Taking high school level courses in prison has less effect on an inmate’s subsequent behavior than taking college-level courses does.
5. The governor’s ultimate goal actually is to gain popularity by convincing people that something effective is being done about crime.

答案C

这道题的arguement是什么呢？难道不是“action is clearly counter to the governor’s ultimate goal”吗？如果是的话，那assumption应该是受过教育的囚犯更不会犯罪才是啊。

请教各位大牛！

arguement应该是那些taken courses的罪犯比没taken的犯罪少，所以这个action is clearly counter to the governor’s ultimate goal

C选项取非后削弱了这个理由，说taken courses的罪犯本来就是那些倾向于少犯罪的人。

所以是正确答案。

假设题可以取非后当削弱题做的