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").
Q: Fact1: Sperm had to swim from male to female reproductive organs for fertilization., Fact2: Male gametes are called sperm., Question: Why do male gametes swim from male to female reproductive organs? (A) temperature changes (B) to leave the egg (C) fertilization (D) competition (E) it needs them (F) to feed (G) permineralization (H) to heal themselves
A:
C