Answer;
C. the boundaries of Earth’s plates.
Step-by-step explanation;
A volcanic belt is a large volcanically active region. Volcanic belts are found above zones of unusually high temperature where magma is created by partial melting of solid material in the Earth's.
Volcanic belts may be formed by multiple tectonic settings. They may be formed by subduction zones, which is an area on Earth where two tectonic plates meet and move towards one another.