C: 说明了这群上大学的罪犯,他们的最初的本质和那些没上大学的是一样的,没有比那些人更不倾向于犯罪。那么,说明这个学习的过程,对减少犯罪是有好处的。所以题干中的结论才可以成立----inmates who had taken such courses committed far fewer crimes overall than other inmates.
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.本来与那些不上大学的是没有区别的,因为上了大学,所以有区别了。
我的理解是: 有人会争辩:inmates who take college-level courses 从主观上会比其他人更不容易再度犯罪,而选项C则排除了这样的可能性,indicate that the college-level courses make a great contribution in decreasing the crime rate. 所以editorial认为this action clearly counter to the governor’s ultimate goal.