If you go to a beach in the continental United States and you are standing on a long, flat strand of sand, and you look away from the open ocean and see only a few low sand dunes and then a large, open waterway, where are you?

A) on a surfing beach in California.
B) on a the Oregon coast at the mouth of river.
C) on a barrier island on the Florida Gulf Coast.
D) You must be on a Pacific Island; there is nothing like that on U. S. coastlines.