The result of plate movement can be seen at
a. abyssal plains
c. plate centers
b. ocean margins
d. plate boundaries

The result of plate movement can be seen at "plat boundaries", since this is where the plates collide and form visible results such as mountain ranges, tsunamis, etc. 

The correct answer is d. plate boundaries

Because of the way that tectonic plates move, at their boundaries you can see how their movement affected the environment. That's why at the place of their movements you can find things like mountains, trenches, oceanic ridges, and various similar things, depending on whether they converged or diverged or one went under another or similar types of movements.