As It Enters a Bay,the Height of a Tsunami Wave

Multiple Choice

As it enters a bay,the height of a tsunami wave:

A) rises because more water from each wave is forced into less space.
B) rises primarily because the bay narrows.
C) rises because of thermal expansion in the warm water of the bay.
D) drops because the wave must spread out and slow as it approaches the shore.
E) drops because as the wave breaks it rushes ahead as a fast-moving swash.