by giladedelman Sun Sep 19, 2010 1:54 pm
Thanks for your question!
On "analyze the argument" questions like this one, where we're asked to identify the role that a particular statement plays, it's imperative that we understand the structure of the argument, starting with the conclusion.
Here, the conclusion is that the only acceptable solution to the false-alarm problem is to fine alarm-owners for the police time they waste. This is based on the premise that burglar alarms, unlike car alarms, are effective in deterring burglaries.
Now, the question asks us about the role of the "burglar alarms are effective" sentence. From the essential work we just did, we already know it's a premise, and just as important, we've identified the conclusion it supports.
(C) is correct. The statement is supposed to provide evidence that imposing a fine is the only solution, as opposed to the more obvious solutions of getting rid of burglar alarms or having police stop responding to them. If police started ignoring them, we could expect the deterrent effect to go down, which the author evidently assumes is unacceptable.
(D) is actually out of scope! This argument is about imposing fines as the solution to the false-alarm problem. It's NOT about police being more inclined to respond to burglar alarms than car alarms -- in fact, it's not about car alarms at all! You could excise the reference to car alarms without in any way affecting the argument.
Another way to look at it is that the argument is not about whether police are inclined to respond to burglar alarms; it's more closely about whether they ought to respond.
(A) is out of scope. Nowhere are the two groups compared.
(B) is incorrect. That claim is simply stated as fact.
(E) is out of scope. The argument never actually makes that claim.
Does that clear this one up for you?