Some of the major characteristics of the adolescent boy are

The correct option is "change in voice and appearance." During adolescence, boys experience significant physical and hormonal changes, leading to growth spurts, changes in body shape, and changes in voice as their vocal cords lengthen and thicken. These changes are associated with the increased production of testosterone, the primary male hormone responsible for the development of male characteristics. Adolescents may also experience emotional changes, such as mood swings and increased risk-taking behavior, as the brain continues to develop during this stage. However, the production of oestrogen and progesterone is a characteristic of females, not males.