Read the passage about a tsunami.

A tsunami is a powerful wave that travels across the surface of the ocean to land. An earthquake on the ocean’s floor is the most common cause of tsunamis. The force of earthquake causes the water to surge in all directions. The resulting tsunamis can create terrible damage when they reach land.

Which phrase from the passage describes the effect of a tsunami?
A. “is a powerful wave that travels”
B. “is the most common cause of tsunamis”
C. “causes the water to surge in all directions”
D. “creates terrible damage when it reaches land”