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 knows that at which point is a woman considered to be menopausal?

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.