Menstrual Cycle Hormone Peaks

Steps:

• Identify menstrual cycle phases: follicular (days 1-14) and luteal (days 15-28).
• Note LH surge triggers ovulation on day 14.
• Recognize progesterone rises post-ovulation, peaking mid-luteal phase (days 19-23).
• Match peaks to option timelines.

Why B is correct:

• Progesterone peaks in luteal phase (days 19-23) to maintain endometrium; LH peaks on day 14 via mid-cycle surge for ovulation.

Why the others are wrong:

• A: Days 12-16 (follicular, LH rising but not peak); days 25-28 (luteal end, progesterone declining, LH low).
• C: Day 13 (LH rising, not peak); days 1-5 (menses, both hormones low).
• D: Day 13 and day 10 (both early follicular, LH and progesterone low).

Final answer: B