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Can someone explain why D is correct? I do not understand how wear and tear on tires are related to automobile exhaust.

@JayDee8732 and @KSmith422, Happy to help. We're looking for the logically strongest counter that Albert can make to Erin's argument. Let's take a look at (D). (D) says, "Most of the PAHs released into the atmosphere are the result of wear and tear on automobile tires." (D) tells us that wear and tear on automobile tires—and not automobile exhaust—is what releases most of the PAHs into the atmosphere. (D) would weaken Erin's argument by weakening her case for the regulation of exhaust, casting doubt on whether or not it would really save thousands of lives. Thus, (D) is the strongest counter Albert can make to Erin's argument, so it's the correct answer choice. Does this make sense? Let us know if you have any other questions!