How Can There Often Be Big Waves at the Coast

How can there often be big waves at the coast when there is little or no wind?

A) The storm generating the waves is far offshore.
B) There must be a point of land that is sheltering your location from the wind.
C) These are small tsunami waves generated by an earthquake.
D) A big ship must have gone by.
E) A playful elephant jumped into the water across the bay.