A hiker descends from the South Rim of the Grand Canyon to the Colorado River. During this

Question:

A hiker descends from the South Rim of the Grand Canyon to the Colorado River. During this hike, the work done by gravity on the hiker is
(a) Positive and depends on the path taken.
(b) Negative and depends on the path taken.
(c) Positive and independent of the path taken.
(d) Negative and independent of the path taken.
(e) Zero.

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