A woman experiences recurrent luteal phase defects despite normal ovulation timing and estrogen levels. Which hormonal consequence is most likely limiting implantation?

💡 Explanation

Successful implantation requires adequate progesterone signaling to prepare the endometrium. Luteal phase defect implies insufficient progesterone receptor activation, because even with normal progesterone levels, the receptors might not be responding. Therefore, D is correct, rather than the other options affecting different hormonal axes.

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