Monica's Grandmother Wants to Teach Her Granddaughter a New Concept

Monica's grandmother wants to teach her granddaughter a new concept. Piaget's theory would suggest that Monica's grandmother should

A) try to teach the concept as early as possible and then find a way for Monica to learn the concept by actively experiencing it.
B) wait to teach the concept until Monica's way of thinking is appropriate and then find a way for Monica to learn the concept by actively experiencing it.
C) try to teach the concept as early as possible and carefully explain all the relevant aspects of the concept to Monica.
D) wait to teach the concept until Monica's way of thinking is appropriate and carefully explain all the relevant aspects of the concept to Monica.