Answer:
C. a mantle plume which causes melting at the surface allowing magma to escape.
Explanation:
Hot spots -
Hot spots refers to the area on the surface of the mantle plume , is referred to as hot spot .
The area under the earth's crust is known as the mantle plume , where the magma is the hottest.
Due to this hot magma , the Earth's crust melts and reduces the layer , which acts as a open for the magma to ooze out , making the area prone to any volcanic eruption.
hence, from the given information of the question,
the correct option is c.