Deep sea corals are organism that habit the deeper and dark parts of the ocean and survive by feeding on tiny organisms washed by currents to obtain nutrients and energy.A major characteristics of these organisms is that they grow very slowly. Fishing practices such as dragging the sea floor with heavy fishing equipment and machines can destroy the homes of these organisms (coral gardens) thus affecting even the other organisms that live among them.
I think the answer would be C) a place where water heated by magma rises from the ocean floor because it is an opening on the Ocean floor that releases heated mineral - rich water.