Fertilisation in humans is practically feasible only if

  • A
    the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the cervix
  • B
    the sperms are transported into cervix within $48$ hrs of release of ovum in uterus
  • C
    the sperms are transported into vagina just after the release of ovum in Fallopian tube
  • D
    the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the Fallopian tube.

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