Soln:

Adolescence is a period of transition from childhood to adulthood. Boys go through the following changes:

• Hair growth in new areas of the body, such as armpits, chest, and between thighs near the genital organ face, legs, and arms.

• Skin becomes oily and pimples emerge

• Penis occasionally erects, especially while dreaming.

 The growth of the voice box or larynx, which can be seen as a projecting region of the throat called Adam’s apple, causes voice cracking in males. In older males, this results in a deeper voice. Puberty does not result in the loss of milk teeth. Puberty has nothing to do with weight increase or decrease.

When comparing males and girls, boys grow taller at a later age.

Therefore, the correct answer is (c) cracking of voice.bio