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: threatening behavior causes a fight-or-flight response in animals, Fact2: Stress triggers the fight or flight response within the body., Question: What do animals feel when threatened? (A) cold (B) negative (C) Sadness (D) Warmth (E) Stress (F) Calmness (G) deadly (H) influenza
E