Answer:
Option A, Tectonic Plates
Step-by-step explanation:
Tsunami is associated with the tectonic plates. When the plate tectonic force pushes the ocean plate below the oceanic mantle, then tsunamis are generated. A large amount of seismic energy is generated when oceanic plate override for a long period of time. When this energy exceeds the frictional energy between two plates overlying water rises and causes Tsunami.
Hence, option A is correct.