A contour line joints locations having the same height above

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A contour line joints locations having the same height above the mean sea level. The following is a contour plot of a geographical region. Contour lines are shown at 25 m intervals in this plot.
The path from P to Q is best described by

[GATE EC 2017 Set 1]

A Up-Down-Up-Down

B Down-Up-Down-Up

C Down-Up-Down

D Up-Down-Up