Teacher:In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
Teacher: Now, understand the problem? Solve this instance: A lot of people think that volcanoes may only exist in tall mountains that tower above us, but a lot of volcanoes (A) fall into the oceans (B) are water leaking volcanoes (C) erupt into the sea (D) are found and erupt beneath the water
Student:
D