Earthquake are frequent in Japan.

The correct answer is: frequent.

Earthquakes are frequent in Japan because the country is located on the Ring of Fire, which is a horseshoe-shaped region around the Pacific Ocean where tectonic plates meet. This region is prone to

The other options are incorrect because they do not accurately describe the frequency of earthquakes in Japan.

• Option A, extinct, is incorrect because earthquakes are not extinct in Japan. In fact, they are quite common.
• Option B, unusual, is incorrect because earthquakes are not unusual in Japan. They are a regular occurrence.
• Option C, few, is incorrect because earthquakes are not few in Japan. They are quite common.
• Option D, rare, is incorrect because earthquakes are not rare in
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  Japan. They are a regular occurrence.

In conclusion, the correct answer to the question “Earthquake are frequent in Japan” is: frequent.