Concept:Human life is divided into stages by age: infancy (birth to about
1 year), childhood (about
1 to
9 years), adolescence (
10 to
19 years, as defined by the World Health Organization), adulthood (from about
20 years) and old age (from about
60 to
65 years).
Solution:The boy is
17 years old.
17 lies between
10 and
19, so he is in the adolescent stage.
He is not an infant (that is the first year of life) and not an old person.
He is also not yet an adult, because adulthood begins after adolescence ends at about
19 years.
Adolescence is the stage of puberty, when the body grows quickly and develops into an adult form.
Answer:Option B (adolescent)