I chosed D over C because the prompt is only concerned with dollar amounts spend on means of transportation but does not indicate how many miles people actually traveled for the dollar amount they spend.
Let's imagine that the majority of residents who traveled by train or car and spend less money on means of transportation traveled (relatively short distances) within the US, and residents who traveled by airplane did so to go i.e. to Europe. If we spread airfare costs over the number of miles
...
Let's imagine that the majority of residents who traveled by train or car and spend less money on means of transportation traveled (relatively short distances) within the US, and residents who traveled by airplane did so to go i.e. to Europe. If we spread airfare costs over the number of miles
...
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