Q: 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: Organisms cluster around hydrothermal vents in the ocean floor., Fact2: Background Hot water vents form inside cracks in the ocean floor., Question: What do organisms cluster around, in the ocean floor? (A) cracks (B) chemicals (C) limestone (D) crust (E) headaches (F) Nutrients (G) horses (H) dogs
A:
A