I notice people using math to solve this CR problem. While this might be effective, it may also be time consuming. The gist of the problem is to resolve the paradox of why airfare accounts for half of money spent despite being used by fewer people. Well, the answer can only be that airfare is, in general, more expensive than other means of transportation and this is what the OA (D) is saying and reality also supports that. Option C is talking about per mile, this is simply out of scope of the
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