Which event is possible when changes in the layer of $zona$ $pellucida$ occur due to sperm at the time of fertilization?

  • A
    Sperm enters into the ovum.
  • B
    Block the entry of additional sperms into the ovum.
  • C
    Stop the fertilization process and prevent pregnancy.
  • D
    Possible fertilization process is facilitated and pregnancy occurs.

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