Question

Sedimentation is least likely to occur:
on a mountainside
in a lake
on a sandbar
in a sand dune

Answer 1

The answer is A. Sedimentation is least likely to occur:
on a mountainside.

Answer 2

Answer:  On a Mountainside.

Explanation: Sedimentation is less likely on  a mountainside, since due to the inclination that it presents, it is most likely that the materials that are released from them by natural agents such as wind or rain, go to more places lows such as rivers, lakes, or flat surfaces where sediments will accumulate and form.