Location of contour gradient for a high way is best set out from

ANS:B - saddle down the hill

A saddle point is the lowest point along a ridge or between two mountain tops and the highest point between adjacent valleys or lowlands.

The saddle is often a drainage divide between different watersheds. Answer saddle down the hill is right because saddle means lower point between two summits and contour gradient mean the horizontal contour or horizontal gradient in the contour. This road we can show in North India.