Question

where is new crust being created?
subduction zones
poles
mid - ocean ridge
deep ocean trenches

Explanation:

Mid - ocean ridges are divergent plate boundaries where magma rises to the surface, cools, and forms new oceanic crust. Subduction zones are where one plate is forced under another, poles are not sites of crust creation, and deep - ocean trenches are associated with subduction, not crust creation.

Answer:

C. mid - ocean ridge