If a woman experiences a shortened luteal phase, which consequence directly compromises the implantation of a fertilized ovum?

💡 Explanation

A shortened luteal phase results in insufficient progesterone production, which is critical for endometrial development. The endometrium requires adequate progesterone exposure to become receptive to implantation because progesterone induces changes necessary for the embryo to implant. Therefore, insufficient endometrial preparation directly compromises implantation, rather than the other options that have less direct effects.

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