The fact that many happy and well-adjusted adults were once rebellious and unhappy as adolescents is most relevant to the issue of

A) continuity or stages.
B) physical or mental development.
C) stability or change.
D) nature or nurture.

Adolescents

Young people in the transitional stage from childhood to adulthood, typically between the ages of 13 and 19.

Well-adjusted

Describes an individual who is mentally and emotionally stable, able to cope effectively with the stresses and demands of life.

Rebellious

Exhibiting defiance against authority or resistance to conventions or norms.