by ManhattanPrepLSAT2 Tue Apr 19, 2011 1:55 pm
Based on what you wrote, I have two suggestions for you:
1) Make sure you understand that a "strengthen" answer will almost always fall BETWEEN your supporting premises and your conclusion.
Here the support is: We have a product for which using more isn't any more effective.
The conclusion is: Therefore, selling for cheaper won't make people buy any more product, and will make it so we lose money.
In reaching this conclusion from this evidence, the author is failing to consider many things: perhaps new customers will buy the product, or perhaps people will buy even more of it even though the manufacturer tells them using more won't be any more helpful. There are some significant gaps between this premise and this conclusion, and the right answer needs to help fill in these gaps.
2) Make sure you understand your job in this question, which is to STRENGTHEN the idea that the company will NOT sell more products, and will NOT be preferable.
Let's evaluate (A) -- does this help strengthen the idea that the company WON'T sell more products? No. In fact, I'd say (A) plays the exact OPPOSITE role -- it gives us a reason to believe they WILL sell more with the rebate.
(B) is a much more attractive answer, but again does it give us a reason to believe that the company WON'T sell any more products with the rebate? No. If I said something like "lowering the price of the candy-bar will/won't increase sales" an answer that says "some people like candy, and others don't" won't have a direct impact on that conclusion.
Hope that is helpful. Please follow up if you have further questions, or if I haven't addressed your concerns, and good luck studying!