题目内容

In an hour, David can wash 2 cars or mow 1 lawn, and Ron can wash 3 cars or mow 1 lawn. Who has the comparative advantage in car washing, and who has the comparative advantage in lawn mowing? ( )

A. David in washing, Ron in mowing.
B. Ron in washing, David in mowing.
C. David in washing, neither in mowing.
D. Ron in washing, neither in mowing.

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