Answer:
Most 8.0 or higher earthquakes occur along plate boundaries.
This includes all of the options provided:
a. continent-continent boundaries,
b. continent-ocean boundaries,
c. ocean-ocean boundaries, and
d. intercontinental boundaries.
Plate boundaries are areas where tectonic plates interact, and they are associated with various types of seismic activity, including earthquakes. The release of accumulated stress along plate boundaries can result in large-magnitude earthquakes. These earthquakes can occur at different types of plate boundaries, such as convergent boundaries (where plates collide), divergent boundaries (where plates move apart), and transform boundaries (where plates slide past each other).