Why do waves increase in height as they approach the shore?

a. The waves are forced into narrow inlets of land.

b. The water particles speed up as they approach land.

c. The water's density decreases because it's warmer near the shore.

d. The waves begin to interact with the ocean floor.

The correct answer for the question that is being presented above is this one: "d. The waves begin to interact with the ocean floor." The waves begin to interact with the ocean floor. The same mass of water runs into shallower and shallower water making the height of the wave increase.