In subduction zone, the denser plate subduct under the less dense plate. Option C is correct.
Subduction Zone:
It is an area where one tectonic plate thrust over the other at the rate of several centimeter per year. These are the seismogenic zone, where earthquake occur frequently.
In the subduction, denser tectonic plate is recycled in the mantle with slow rate because less dense plate float over the mantle more than the dense plate.
Therefore, when two plates form a subduction zone, the denser plate will subduct into the mantle.
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