The inference is that the best title for the Passage will be B. Understanding earthquake.
It should be noted that earthquakes can start miles below Earth's surface. All of the water and land on Earth rests on top of giant plates that fit together like puzzle pieces. These are called tectonic plates. These tectonic plates are always moving and are always pressing against each other.
Furthermore, an earthquake usually occurs where two of the plates meet. The edges of the plates are rough, and sometimes they get caught while the rest of the plate continues to move
Therefore, the inference is that the best title for the Passage will be understanding earthquake.
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