Q23 - Robert: Speed limits on residential streets

[lolitatrekkie]

I was stuck between answer choice C and D and I ended up choosing D instead of C and I don't understand why C is correct?

I thought it was D because it mentions that "the people who are affected by the problem Robert describes would be harmed by the installation of speed bumps and warning signs" which I thought made sense with what Sheila was saying about people loosing control of their cars that they would bump into speed bumps which means people could get hurt by it. Is D wrong because the word "most" in the sentence is exaggerated?

Is this question a Necessary Assumption question?

Thanks!

[ManhattanPrepLSAT1]

You've got it lolitatrekkie!

This is a Necessary Assumption question. And answer choice (D) is wrong because it's too strong. You're clearly developing an ear for the LSAT.

The question asks for an assumption of Sheila's response to Robert. She says that speed bumps and signs warning of their presence would be a bad idea, because people who drive too fast are likely to lose control when they hit speed bumps.

This assumes that there will be people who drive too fast once the speed bumps and signs warning of their presences are installed. Why couldn't it turn out that folks simply minded the speed bumps and drove at appropriate speeds given their presence? Answer choice (C) speaks to this very issue.

Incorrect Answer
(A) is out of scope. No comparison to other cities need be assumed.
(B) is out of scope. Robert's intent is not an issue in Sheila's argument.
(D) is too strong. Sheila's argument would still stand even if only a few of the people affected by the problem were harmed by the installation of speed bumps.
(E) is out of scope. Nonresidential streets are not a concern for Sheila's argument.