Answer:
A
Explanation:
Earthquakes are said to occur at faults where tectonic plates run into each other because they have been observed to occur at those tectonic plate boundaries.
Part of the evidence for the theory of plate tectonics is the predictable occurrence of earthquakes and volcanoes along plate boundaries. The Pacific Ring of Fire is an example of a seismically active zone that has been observed and labelled based on the noted activity.