Ovulation timing in the menstrual cycle

Steps:

• Start counting from day 1 as the first day of menstruation.
• Monitor hormone levels: rising estrogen leads to LH surge signaling ovulation.
• Identify LH peak or basal body temperature rise to pinpoint ovulation day.
• Data shows peak on day 11, confirming ovulation.

Why C is correct:

• Ovulation is defined by the LH surge, which occurs on day 11 per the cycle data.

Why the others are wrong:

• A: Day 1 marks menstruation start, not ovulation (follicular phase begins).
• B: Day 5 is still early follicular phase; no LH surge yet.
• D: Day 27 is luteal phase; ovulation already passed in a typical 28-day cycle.

Final answer: C