According to Piaget, There Are Three Significant Equilibration Points, Each

According to Piaget, there are three significant equilibration points, each ushering in a new stage of development. When do they occur?

A) 18 months, ages 5 to 7, and late childhood
B) 18 months, late childhood, and adolescence
C) 6 months, 18 months, 24 months
D) infancy, toddlerhood, preschool
E) 18 months, ages 5 to 7, adolescence