Definition: 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").
Input: Fact1: Population size influences the chances of a species surviving., Fact2: Colors of the bees also varies with the species., Question: What influences the survival chances of bees? (A) population name (B) the environment (C) the flavor of their honey (D) population size (E) temperature (F) Temperature changing (G) local weather changes (H) the number of stripes
Output:
D