What happens in the archegonium?\nOptions:\n- (A) eggs separate\n- (B) Earth orbiting the Sun\n- (C) sperm and egg fuse\n- (D) competition\n- (E) fallopian tubes join\n- (F) permineralization\n- (G) It expands\n- (H) cloning Let's solve this problem gradually.

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Fertilization occurs when sperm swim to an egg inside an archegonium. Fertilization occurs when the egg and sperm fuse and join. An egg and sperm can fuse when sperm swim to an egg inside an archegonium. So the final answer is (C).
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