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: Fertilization occurs when sperm swim to an egg inside an archegonium., Fact2: Pregnancy begins with a fertilized egg., Question: Sperm swim to an egg inside a what? (A) gastropod shells (B) aqueous solution (C) archetype (D) archive (E) ocean water (F) pollen (G) archegonium (H) sperm
G