GMAT求帮助啊,两道GWD的题

GMAT求帮助啊,两道GWD的题
Newspaper editorial:
In an attempt to reduce the crime rate,the governor is getting tough on criminals and making * 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 form *,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?
A.Not being able to take college-level courses while in * is unlikely to deter anyone from a crime that he or she might otherwise have committed.
B.Former inmates are no more likely to commit crimes than are members of the general population.
C.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.
D.Taking high school level courses in * has less effect on an inmate’s subsequent behavior than taking college-level courses does.
E.The governor’s ultimate goal actually is to gain popularity by convincing people that something effective is being done about crime.
疑问A为啥不行啊,A 是不是说学了这些可程就能震慑住这些罪犯啊?
GWD7-Q17:
Of patients over 65 years old who survived coronary bypass surgery—a procedure widely prescribed for people with heart disease—only 75 percent benefited from the surgery.Thus it appears that for one in four such patients,the doctors who advised them to undergo this surgery,with its attendant risks and expense,were more interested in an opportunity to practice their skills and in their fee than in helping the patient.
Which of the following,if true,most seriously undermines the argument?
A.Many of the patients who receive coronary bypass surgery are less than 55 years old.
B.Possible benefits of coronary bypass surgery include both relief from troubling symptoms and prolongation of life.
C.Most of the patients in the survey decided to undergo coronary bypass surgery because they were advised that the surgery would reduce their risk of future heart attacks.
D.The patients over 65 years old who did not benefit from the coronary bypass surgery were as fully informed as those who did benefit from the surgery as to the risks of the surgery prior to undergoing it.
E.The patients who underwent coronary bypass surgery but who did not benefit from it were medically indistinguishable,prior to their surgery,from the patients who did benefit.
这题答案选的E,疑问为什么B不行啊,我觉的B更是削弱啊,尽管人们受益的不多,但是这个受益大啊,