In humans,fertilization is only possible if:

  • A
    The ovum and sperms are transported simultaneously to the ampullary-isthmic junction of the fallopian tube.
  • B
    The ovum and sperms are transported simultaneously to the cervical-ampullary junction of the uterus.
  • C
    Sperms are transported into the cervix within $48$ hours of the release of the ovum.
  • D
    Sperms are transported into the vagina just after the ovum is released into the fallopian tube.

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