Which of the following can scientists use to identify where earthquakes will most likely occur?
a: seismic gaps
b: plate boundaries
c: proximity to a volcano
d: seismographs

Option (B)

Explanation:

The earthquakes are generated due to the motion of plates. This plates floats over the layer of asthenosphere due to the formation of convection current in the mantle. It is because of the heat that is generated from the interior of the earth.

This plate when moves, wither collides or diverges or conserves. As a result of this, the rocks undergoes deformation and it releases a certain amount of energy that generates in the form of seismic P and S waves. These waves are responsible for the occurrence of earthquake.

Thus, a scientist can consider that the earthquakes are most likely to occur along the plate boundaries.

Hence, the correct answer is option (B).