In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Fact1: an aquatic animal requires great amounts of water to survive, Fact2: Fish can survive in water by using their gills to extract the dissolved oxygen., Question: What requires great amounts of water to use their gills to extract dissolved oxygen? (A) most cephalopods (B) alligators (C) starfish (D) aquatic animals (E) Jellyfish (F) water foul (G) platypus (H) Lobsters
D