Answer:
B. is the answer
Explanation:
The explanation is a lot simpler than the other three answers provided in the question. Since the oceanic crust is under the water it will cool over a long period of time. Because of the cooling it becomes more dense because when objects cool they shrink in size. Besides this even ocean water may be trapped in the crust and that will also contribute to the density of the oceanic crust. So the more dense crust will sing under the continents.
