Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions
TSUNAMIS
Tsunamis are waves, but they are far different from the normal waves that occur every day in the ocean. A normal wave is created by the pull of the moon’s gravity, but tsunamis are a series of great sea waves that are created by a shock from underwater. The most common causes of tsunamis are underwater earthquakes, landslides, or volcanic eruptions.
On Sunday, December 26, 2004, a 9.0-magnitude earthquake occurred under the Indian Ocean near the west coast of the Indonesian island of Sumatra . It displaced a large amount of water, and sent shock waves in every direction, resulting in a series of a 30-foot waves travelling up to 500 miles per hour. These high speeds cause the waves to be very destructive. They traveled unnoticed at first because they were not visible on the surface, a common pattern in the occurrence of tsunamis.
According to the passage, What can create a tsunami?
A.A large rock dropping into the ocean
B.It is not known
C.The pull of the moon’s gravity
D.Shocks that occur underwater