manhattan模考的一道逻辑题，求助~

ctuwuzida

Doctor: Research shows that adolescents who play video games on a regular basis are three times as likely to develop carpal tunnel syndrome as are adolescents who do not play video games. Federal legislation that prohibits the sale of video games to minors would help curb this painful wrist condition among adolescents.

The doctor’s conclusion depends on which of the following assumptions?

A    The majority of federal legislators would vote for a bill that prohibits the sale of video games to minors.

B    Not all adolescents who play video games on a regular basis suffer from carpal tunnel syndrome.

C    laying video games is the only way an adolescent can develop carpal tunnel syndrome.

D    Most parents would refuse to purchase video games for their adolescent children.

E    The regular playing of video games by adolescents does not produce such beneficial effects as better hand-eye coordination and improved reaction time.
我选的是C，答案选的是D~

ctuwuzida

好像发错了板块~

sdcar2010

Necessary assumption. Use negation.

If you negate D), you have:
Most parents would NOT refuse to purchase video games for their adolescent children.
If so, the ban on teenagers from buying the game would have little effect on the actual sale since their parents would be the legitimate buy of the game for their beloved children. Then the conclusion of the passage would fall apart. D) is the necessary assumption for the argument.

C) on the other hand is too restrictive (the only way). Most restrictive statement would not be the right answer for a necessary assumption question. Plus, if you negate C), the argument still holds.