Hi, All---
My line of thinking on this problem is pretty much the same as emrahinci and dingo001's: I went with B. Since the correct answer is C, I was trying to figure out why B is wrong. I didn't think the OA explanations where that great. The OA explanation says that B is wrong because "This statement does not address the question of whether the new parking will reduce the damage by engine exhaust from the buses."
B "feels right," but I suppose this C was the better choice because it strengthened the specific argument about the parking lot reducing exhaust. Was B a trap? I can't help but think B is an assumption necessary for this argument. For example, it doesn't matter how much parking is added if there are other pollutants causing more damage to the buildings. Wouldn't this be the foundation needed to prop up this argument? I understand how C strengthens the argument, but I can't help but think that the root issue was better tackled by B.
Pls let me know where I'm going wrong. Thanks.