Human body undergoes several changes during adolescence. These changes marks onset of puberty.

The correct option is A True

Adolescence:

1. Adolescence is that time when a child reaches reproductive maturity.
2. Adolescence begins around the age of 11 and goes on until 18 or 19 years of age.
3. Human body undergoes several changes during adolescence.
4. These changes marks onset of puberty.

Final answer: The given statement is true.