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What triggers the completion of meiosis of secondary oocyte?

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What triggers the completion of meiosis of secondary oocyte?

(a) Maturation of Graafian follicle

(b) Entry of sperm into the egg cell

(c) Release of estrogen

(d) Coitus

This question was posed to me in an international level competition.

My query is from Human Reproduction topic in portion Human Reproduction of Biology – Class 12

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Correct choice is (b) Entry of sperm into the egg cell

Easy explanation: The secondary oocyte released from the ovary has finished first round of meiosis. The second round of meiosis occurs in ampulla after the egg encounters the sperm. This leads to formation of large ovum and a tiny second polar body.

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