Megathrusts Between Subducting Oceanic Crust and an Overriding Plate Are

Megathrusts between subducting oceanic crust and an overriding plate are a potential source of tsunamis because ________.

A) the earthquakes on these faults are underwater and could displace large amounts of water from the oceans
B) the earthquakes on these faults are underwater and could release large amounts of water from the asthenosphere
C) one side of the fault is on land and the other is underwater so an earthquake could cause a landslide or tsunami depending on which side moved
D) oceanic crust is "thrust" over the continent along a megathrust so that forces the land downward producing a tsunami