求助两道难题，多谢！！

xp2011

14. Forone academic year all the students at a high school were observed. The aim was to test the hypothesis that studying more increased a student's chances of earning a higher grade. It turned out that the students who spent the most time studying did not earn grades as high as did many students who studied less. Nonetheless, the researchers concluded that the results of the observation supported the initial hypothesis.

Which one of the following, if true, most helps to explain why the researchers drew the conclusion described above?

(A) The students who spent the most time studying earned higher grades than did some stuents who studied for less time than the average.
(B) The students tended to get slightly lower grades as the academic year progressed.
(C) In each course, the more a student studied, the better his or her grade was in that  course.
(D) The students who spent the least time studying tended to be students with no more than average involvement in extracurricular activities.
(E) Students who spent more time studying understood the course material better than other students did.


25. Sociologist: Widespread acceptance of the idea that individuals are incapable of looking after their own welfare is injurious to a democracy. So legislators who value democracy should not propose any law prohibiting behavior that is not harmful to anyone besides the person engaging in it. After all, the assumptions that appear to guide legislators will often become widely accepted.

The sociologist's argument requires the assumption that:

(A) democratically elected legislators invariably have favorable attitudes towards the preservation of democracy.
(B) people tend to believe what is believed by those who are prominent and powerful.
(C) legislators seem to be guided by the assumption that individuals are incapable of looking after their own welfare, even though these legislators also seem to value democracy.
(D) in most cases, behavior that is harmful to the person who engages in it is harmful to no one else.
(E) a legislator proposing a law prohibiting an act that can harm only the person performing the act will seem to be assuming that individuals are incapable of looking after their own welfare.

sdcar2010

Both are old LSAT questions.

14(C) supports the hypothesis that time spent in studying correlates to better grade.

15(E) necessary assumption, use negation. If you negate (E), the argument falls apart. Try it yourself.