A. You climb
B. You walk
C. You decend
D. Both A & C
I think it is D but I'm not sure..
As you cross contour lines, you are changing altitude. So you are climbing or descending depending on which way you are walking. I think it's D too!
I think the writer of the test blew it.
You cannot simultaneously climb AND descend.
If D said "Either A or C" then it would be OK.
I would choose D and put a note to the effect that it should be OR
you climb and descend
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