Kate celebrated her thirteenth birthday. What is likely to occur at this age? A. She begins to participate in imaginative play. B. She may experience the start of the menstrual cycle. C. She loses her primary teeth. D. She takes important decisions in life, the way adults do.

She may experience the start of the menstrual cycle.

Explanation:

Menstruation - also known as periods - is when the inner lining of the uterus is shed. It usually starts around the onset of puberty, between the ages of 12 and 15. Menstruation ceases around age 45-55 after the menopause.

Interestingly, the average age of a girl's first period is generally later in the developing world, and earlier in the developed world.

Imaginative play and losing primary teeth occur much earlier in development.