Earthquakes can cause another type of natural disaster known as a tsunami. A tsunami is a series of enormous sea waves often caused by earthquakes that occur on the seafloor. The energy produced by an earthquake creates the force behind a tsunami. Tsunami waves can travel thousands of miles across the ocean. A tsunami wave begins deep underwater and speeds quickly toward shore. As the ocean becomes shallower, the wave appears above the surface. The biggest tsunamis can be as tall as a ten-story building. Waves this large can destroy entire cities.

What is the central idea of the paragraphs?

A.
A tsunami is a type of natural disaster that begins on the ocean floor.
B.
Giant waves called tsunamis have as much force as the earthquakes behind them.
C.
The energy produced by an earthquake on the ocean floor can create a series of waves called a tsunami.
D.
Some of the biggest earthquakes in the world occur in the ocean and produce disasters known as tsunamis. (language arts)