A Group of Nursing Students Plan to Teach a Class

A group of nursing students plan to teach a class of 6th-grade girls about menstruation. They would teach them that:

A) Menarche usually occurs around 12 years of age.
B) Ovulation occurs regularly from the very first cycle.
C) A regular cycle is established by the third period.
D) Typically, menstrual flow is heavy and lasts up to 10 days.