Which of the following best explains why only a small fraction of sperm released during ejaculation reach the egg for potential fertilization?单项选择题

A

A. Sperm lack the necessary genetic material and are programmed to self-destruct before reaching the uterus.

B

B. Most sperm are blocked by the cervix, and only the ones with the correct genetic match can pass through.

C

C. Although up to 300 million sperm are released, many get lost, tangled, or have defects.

D

D. The fallopian tubes release enzymes that destroy the majority of sperm to prevent multiple fertilization events.

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