A - We need to strengthen the conclusion that genetics are a factor in perfect pitch. Answer choice A proposes that people with perfect pitch don't receive more training than other people which strengthens the argument that pitch is genetic. Completed in 35 secs and correct on first try.

C is the right answer because we need to strengthen the conclusion that large corporations have made it a point to discourage alternative energy projects and that their actions influenced the government's decision to fund them less -

This answer choice strongly supports that this is the case by stating that the ONLY research projects whose funding has been severely curtailed are the ones that large corporations have made a point to discourage. Right on first try and 1 second over.

Got it right - the part in the stem where it mentions that people against the freeway were 2 to 1 has to be explained - D explains this because it tells us that twice as many people were already against the highway.

5/5 first try!!