It can be inferred from the passage that tsunamis .

A. are often identified by ships on the ocean

B. are far more dangerous on the coast than in the open ocean

Thông tin: In the open ocean, tsunamis have little noticeable amplitude, often no more than one or two meters. It is when they hit the shallow waters near the coast that they increase in height, possibly up to 40 meters.

Chọn B