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Letter C represents a fault.

Explanation:

In the image, we have represented surface features of an earthquake. Letter C in particular represents a fault. The fault is actually responsible for the earthquake as a geological feature, though behind it we have the movement of the tectonic plates driven by the convection currents.

The faults form at transform plate boundaries. This type of plate boundary occurs between tectonic plates that slide past each other. Because they slide past each other and are in constant contact, there is constant tension along the plate boundary, which in turn results in cracking of the crust and regular adjustments. When the cracking of the crust is visible on the surface, we have a fault. Along the faults, we have the most active places on Earth when it comes to earthquakes.