Question

Garrett notices a small island has formed off the coast of his hometown in Florida. Which of the following best describes what caused the island to form?
The sand was deposited into a pile by the action of waves.
Beach sand that was eroded from the local beach formed an island.
The sand was a remnant from a tropical storm that had a large storm surge.
Erosion of the areas behind the island caused it to be surrounded by water.

Answer 1

I would say either the first, second, or fourth answer; waves have a very strong impact on the movement of sand and other particles under the water. Erosion of particles off an island are similar in this case.
It wouldn't be anything about a tropical storm; it's no where in the question and we don't know how many storms Florida has or how strong they are.

Answer 2

well I know that it's not B. Beach sand erosion.