Where are earthquakes and volcanos most likely to occur? plate boundaries

hot spots

within oceanic plates

continental boundaries

plate boundaries

Explanation:

Volcanoes and earthquakes are most likely to form along plate boundaries.

Earthquakes:

An earthquake is generated when two plates move relative to each other. The earthquake itself, is the movement felt on the surface caused by the movement of the tectonic plates at their boundaries. There are a few different types of plate boundaries, NOAA does a great job giving a brief description of each here:

http://oceanexplorer.noaa.gov/facts/plate-boundaries.html