Best supports the idea that the author assumes that, all things being equal, people would rather drive than take mass transit is lines 1-5 (“Building… car”)
In the initial paragraph, the author tells that “Building good transit isn't a bad idea, but it can backfire if new trains and buses only free up freeway lane space for those who would rather drive—a group that has historically included almost everyone who has access to a car.” In this sentence, the author bases his claim about the unintended consequences of building public transportation on the expectation that most people would rather drive a car than take trains and buses. Thus, this sentence best supports the idea that the author assumes that, all things being equal, people would prefer to use cars rather than public transportation.
Hence, the correct answer is Lines 1-5 (“Building… car”)
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