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assumption question

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assumption question [#permalink] New post 12 May 2007, 07:58
A large number of drivers routinely violate highway speed limits. Since driving at speeds that exceed posted limits is a significant factor in most accidents, installing devices in all cars that prevent those cars from traveling faster than the speed limit would prevent most accidents.
  
Which one of the following is an assumption on which the argument depends?

(A) A person need not be a trained mechanic to install the device properly.
(B) Most accidents are caused by inexperienced drivers.
(C) A driver seldom needs to exceed the speed limit to avoid an accident when none of the other drivers involved are violating the speed limit.
(D) Most drivers who exceed the speed limit do so unintentionally.
(E) Even if the fines for speed-limit violations were increased, the number of such violations would still not be reduced.

why is it c?
  
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 [#permalink] New post 12 May 2007, 08:24
It is C, because if drivers usually needed to exceed the speed limits to prevent an accident, the conclusion of the argument (installing devices in cars that prevent those cars from traveling faster than the speed limit would prevent most accidents) wouldn't be truth.
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 [#permalink] New post 14 May 2007, 05:51
Why not D ?
What is AO ?
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 [#permalink] New post 14 May 2007, 05:55
the OC is C

bc if we negate the answer

"drivers need to speed in order to avoid accidents" it disproves the assumtpion... basically, if u negate an assumption and it weakens it, it is the correct one.
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 [#permalink] New post 14 May 2007, 05:58
the OC is C

bc if we negate the answer

"drivers need to speed in order to avoid accidents" it disproves the assumtpion... basically, if u negate an assumption and it weakens it, it is the correct one.

D if u negate it, does not weaken the answer

"drivers
  [#permalink] 14 May 2007, 05:58
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