_______ is the study of earthquakes.

Correct option is A

The correct answer is Seismology.

• A seismologist is a scientist who studies earthquakes and seismic waves.
• An earthquake in simple words is the shaking off the earth.
• It is a natural event.
• It is caused due to release of energy, which generates waves that travel in all directions. 

Information Booster:

• The study of seismic waves provides a complete picture of the layered interior.
• Seismology is the study of earthquakes and seismic waves that move through and around the Earth.
  
• All natural earthquakes take place in the lithosphere.
• The earthquake events are scaled either according to the magnitude or intensity of the shock.
• The magnitude scale is known as the Richter scale.