Children's Self-Concepts Become Increasingly Stable, and Therefore Increasingly More Difficult

Children's self-concepts become increasingly stable, and therefore increasingly more difficult to change, as they grow older.Which one of the following is the most likely explanation for the increasing stability of self-concept over time?

A) Maturational factors play a major role in the formation of self-concept; these factors continue to unfold throughout childhood.
B) Research studies indicate that self-concept has a strong genetic component.
C) Most of a student's teachers and classmates behave in ways that consistently lower the student's self-concept.
D) Children will behave in ways consistent with their self-concepts, thereby reaffirming their views of themselves.