A woman reports that her last normal menstrual period began on June 14, 2025. What is this woman’s expected delivery date using Nagele’s rule?

Naegele's rule calculates the estimated date of delivery by taking the first day of the last normal menstrual period, subtracting three months, adding seven days, and then adding one year. Starting from June 14, 2025: subtracting three months gives March 14, 2025; adding seven days gives March 21, 2025; adding one year gives March 21, 2026. This matches the option stating March 21, 2026, confirming the keyed answer is correct. The option listing March 17, 2026 would result from incorrectly adding only three days instead of seven. September 7, 2025 would be reached by adding approximately 12 weeks forward rather than applying Naegele's rule correctly. April 17, 2026 appears to result from adding one month instead of subtracting three, then adding days, which is an incorrect application of the formula. Naegele's rule assumes a regular 28-day menstrual cycle and ovulation on day 14; adjustments may be needed for cycles of different lengths, but for test purposes the standard formula is applied as described.