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: Ejaculation occurs when muscle contractions propel sperm from the epididymes., Fact2: Male gametes are called sperm., Question: What occurs when muscles contract and propel male gametes? (A) fertilization (B) sex (C) ejaculation (D) electrically (E) rapid expansion (F) motion (G) competition (H) intercourse
C