Soln:

Adolescence is a period of transition from childhood to adulthood. During adolescence following changes occur in girls-

• Hair growth in new areas of the body, such as armpits, between the thighs around the sexual organ, and on the arms and legs.

• Start menstruating

• The skin will become greasy and pimples will occur

• The breast size will increase.

Therefore, the correct answer is (d) menstruation.