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Main argument: Increasing speed limit will decrease highway safety.
Evidence: Increasing speed limit will increase average highway speeds.
Assumption which bridges the gap between the evidence and the argument: Increased highway speeds will decrease highway safety.
To weaken the argument, we need to cast doubt on the assumption.
(A) This is more or less just rephrasing the last portion of the last sentence "almost all drivers who obey current speed limits would likely increase their speed", since it uses the term almost all, it can be assumed that some wont.
(B) Correct, this indicates that a higher average highway speed wont be any more dangerous, and may actually be less dangerous.
(C) This doesn't indicate that they will be any more or less dangerous with the new speed limits.
(D) This is similar to (A) in that it's basically rephrasing "most drivers who currently violate speed limits would obey higher ones" since it uses the term "most", it is implied that some wont.
(E) If anything, this strengthens the argument, since it indicates that the higher speed limits wont cause fast drivers to driver any faster.
i tend to choose A in this CR. the E opposed the idea that the highway limits should be increased by saying that if the highway speed would be increased, drivers who violated the posted speed limits would also increase the speed and even the people who have never violated the speed limit would also ruin the speed limits they obeyed >> harm!
we have to weaken that its not harm when we increase the speed limit because the drivers who obey the limit will not increase the speed limit...
B is out of scope for me. Umiformity is never mentioned in the text. and we dont care of it. i guess this is a LSAT question and i dont like this. its a bit awkward
Also, (A) does not indicate that people will not drive faster.
(1) The argument says that most drivers who currently obey the speed limit will increase their speed (2) Answer choice (A) says that some drivers who currently obey the speed limit will not increase their speed
Say 98% of drivers who currently obey the speed limit increase their speed when the limits are raised. This would still satisfy both (1) and (2).
Be careful of "most" and "some"; those words are very important. Split the argument in parts and divide premises and countepremises. The question is easy; the difficult is in how it was written.
"Life’s battle doesn’t always go to stronger or faster men; but sooner or later the man who wins is the one who thinks he can."
My Integrated Reasoning Logbook / Diary: http://gmatclub.com/forum/my-ir-logbook-diary-133264.html