Progesterone is a very important component of oral contraceptive pills. It prevents implantation by ..........

  • A
    inhibiting ovulation
  • B
    inhibiting cleavage in the fertilized egg
  • C
    creating an unfavorable chemical environment for sperm survival in the female reproductive tract
  • D
    altering the quality of cervical mucus to prevent/retard entry of sperms

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