Because of its proximity to the Ring of Fire, Southeast Asia often is threatened by massive and destructive waves called __________.

Massive waves generated by underwater earthquakes or volcanic activity are called tsunamis. Southeast Asia is near the Ring of Fire, where such events are common, so the best answer is B, tsunamis. Monsoons are seasonal winds and rains, earthquakes are ground shaking, and typhoons are tropical storms.

AI-written and checked against the verified answer.