When riding a 10-speed bicycle up a hill, a cyclist shifts the chain to a larger-diameter gear attached to the back wheel. Why is this gear preferred to a smaller gear?
(a) The torque exerted by the chain on the gear is larger.
(b) The force exerted by the chain on the gear is larger.
(c) You pedal more frequently to travel the same distance.
(d) Both a and c are correct.
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