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In order to climb a steep hill on a bicycle, a rider shifts to the lowest gear. The lowest gear has the greatest mechanical advantage because it

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W0lf93
makes rotating the pedals easier, resulting in more power being transferred to the bicycle. The more power the bicycle has, the easier it is to lift the weight of the bicycle against the gravity pulling the bicycle down.
shakirar32

The answer to your question is (B) because it does requires the least amount of force for the bicycle to climb the hill.