The post-fertilization change involves,

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(B) During the process of fertilization,the sperm enters the secondary oocyte. This entry triggers the completion of $Meiosis \ II$ in the secondary o

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introduction of centrioles in the ovum

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(B) During the process of fertilization,the sperm enters the secondary oocyte. This entry triggers the completion of $Meiosis \ II$ in the secondary oocyte,which was previously arrested at the metaphase $II$ stage. Additionally,the sperm contributes its centriole to the ovum,which is essential for the formation of the spindle apparatus required for the first mitotic division of the zygote. Therefore,the introduction of centrioles into the ovum is a critical post-fertilization event.

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