A nurse is teaching a client about family planning using the basal body temperature method. Which of the following instructions should the nurse include in the teaching?

Rationale: A. Take your temperature 1 hour after getting out of bed: Delaying temperature measurement can result in inaccurate readings due to physical activity or environmental changes, making it unreliable for detecting ovulation patterns. B. Take your temperature every night before going to bed: Basal body temperature (BBT) must be taken in the morning, not at night, because the temperature needs to reflect complete rest, which occurs after several hours of sleep. C. Take your temperature within 30 minutes after your first morning void: Voiding and moving around before taking your temperature can alter the basal reading, reducing the method’s accuracy for predicting fertile days. D. Take your temperature immediately after waking and before getting out of bed: BBT should be taken at the same time each morning immediately upon waking and before any activity to ensure the most accurate and consistent readings for fertility tracking.