A 48-Year-Old Woman Tells the Nurse,"I Missed My Period Last

A 48-year-old woman tells the nurse,"I missed my period last month.Am I in menopause?" The nurse would respond that a woman is considered to be menopausal when:

A) her periods have stopped for 1 year.
B) her periods have been irregular and light for 12 months.
C) she has symptoms of vasomotor instability.
D) she experiences symptoms of decreased estrogen, such as dyspareunia.