Answer:
B. 25.
Step-by-step explanation:
Normally the life of a human breaks into various stages like infancy, childhood, adolescence, old age ,and adulthood which depends upon the level of age.
Like we can say that in the age of 18 the person is an adult but at the age of 25 he has reached to the level of maturity in term of mental, physical, strength, emotional, etc
And at this level, the development normally stops i.e brain not with the person body
Hence, option b is correct