In "the Deadliest Tsunami in History," warning for an approaching tsunami can be difficult because a. the large waves are very small when out at sea.
According to "the Deadliest Tsunami in History," the author talks about the difficulty in warning people for an incoming tsunami because the people may not take the warnings serious because the large waves appear small when out at sea.
A tsunami is a natural disaster that occurs when large waves cause a disturbance out at sea and can sink and destroy anything in its path
Therefore, the correct answer is option A.
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