A passage about urban planning argues that mixed-use zoning reduces car dependency. The author then cites a study showing that residents of mixed-use neighborhoods walk more. This study functions in the argument as:
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A
A concession that weakens the author's main claim
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B
An analogy drawn from a different policy context
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C
Empirical support for the causal link between zoning and behavior
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D
A counterexample that the author must explain away