When two plates collide at a convergent boundary the denser plate is pushed beneath the other and is subducted into the Mantle. Thus, the correct answer is D.
What is the mantle of the earth?
The mantle is the majority of the Earth's interior that is mainly solid. Between the dense, super-heated core of the Earth and its thin outer layer, the crust, lies the mantle.
One of the plates is forced under the other at an ocean-ocean convergent boundary, or subducted. The older, colder plate is often denser and subducts beneath the younger, hotter layer.
Therefore, the option D Denser plate is pushed beneath the other is the correct answer.
Learn more about the mantle, here:
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