Trekking Uphill Is Much Easier On Paper Than In Real Life

Calculus Level 1

Sarah and Shane plan to hike from Mead Mountain, to checkpoint A, to Cove Hill, to checkpoint B and finally to Great Pond Mountain. They have plotted their course in green in the above topographical map, which shows contour lines at intervals of 20 meters.

Which of the following routes would they experience the steepest ascent?

Image credit: Wikipedia
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