In oogenesis, which of the following events occurs immediately following the completions of meiosis II?

C. The secondary oocyte is arrested in metaphase of meiosis II, and it will remain in this mei-otic stage until fertilization occurs. Following fertilization, the secondary oocyte completes meiosis II, forming a mature ovum and a polar body. The nucleus of the mature ovum is called the female pronucleus, which fuses with the male pronucleus to form a zygote.