Final Answer:
The earliest visible sign that a boy is reaching puberty is usually Growth spurt.
thus correct option is c) Growth spurt
Step-by-step explanation:
During puberty, boys undergo various physical and hormonal changes, marking the transition from childhood to adulthood. The growth spurt, identified by a rapid increase in height, is typically the first visible sign of puberty in boys. This surge in growth is primarily fueled by the release of growth hormone and the maturation of the skeletal system.
As the growth spurt occurs, boys often experience a temporary awkwardness as their limbs may grow at different rates. This is a result of bones elongating at varying paces during this rapid growth phase. While facial hair growth (b), deepening voice (a), and acne development (d) are also characteristic signs of puberty, they usually manifest later in the process.
The growth spurt typically begins around the age of 10 to 14, varying among individuals. This phase is crucial for the development of secondary sexual characteristics, including the widening of shoulders and the emergence of more masculine features. In summary, the growth spurt is a key early indicator of puberty, reflecting the dynamic physiological changes that accompany the transition from childhood to adolescence in boys.
thus correct option is c) Growth spurt