You will be given a definition of a task first, then some input of the task.
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: Mutation creates new genetic variation in a gene pool., Fact2: Fertilization increases genetic variation., Question: The gene pool expands through fertilization and: (A) offspring (B) agriculture (C) mutation (D) babies (E) seeds (F) zygotes (G) relocation (H) competition
Output:
C