## Core Concept
The adolescent growth spurt is a period of rapid growth and development during puberty. In boys, this growth spurt is influenced by the increase in testosterone levels, which stimulates growth and bone maturation. Understanding the timing of this growth spurt is essential for pediatricians and healthcare providers to monitor growth and development.

## Why the Correct Answer is Right
The maximum growth spurt in boys occurs during the late pubertal stage, approximately at a bone age of 14 years. This corresponds to a chronological age of around 13-14 years in boys, during which they experience a significant increase in height and weight. This growth spurt is driven by the surge in testosterone levels, which promotes the proliferation and differentiation of cartilage cells in the growth plates of bones.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because it does not accurately represent the timing of the maximum growth spurt in boys.
* **Option B:** This option is incorrect as it does not correspond to the late pubertal stage when the maximum growth spurt occurs.
* **Option D:** This option is incorrect because it suggests an earlier age for the maximum growth spurt, which is not consistent with the typical growth and development patterns in boys.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the growth spurt in boys typically occurs about 2 years later than in girls. Clinically, this is important for monitoring growth and development, as well as for identifying any potential growth disorders. Healthcare providers often use growth charts to track a child's growth over time and detect any deviations from the expected growth pattern.

## Correct Answer: C. 14 years.