i'm stuck on problem c and d

First off. some questions are wrong. Here's all the answers.

A) iii. There is new crust forming near the boundary where the plates are pulling apart

B) i.  At the boundary of the continent and ocean basin

C) Confusing question. But I think your arrows are correct.

D) The locations of the young and old rocks provide evidence that the plates are moving because the youngest rock is closest to the boundary and the oldest rock is farthest away which shows that rock is rising and moving apart because of convection currents inside the mantle.