Given the task definition and input, reply with output. 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: if a habitat can no longer support animals then those animals will move to another area, Fact2: Animals are dependent on plants for food and habitat., Question: What needs to be lacking for a creature to change habitat? (A) warmth (B) inedible plants (C) wind (D) oxygen (E) nektar (F) food (G) O2 (H) dirt
F