For Both Piaget's Stages of Cognitive Development and Erik Erikson's

For both Piaget's stages of cognitive development and Erik Erikson's stages of emotional and social development,

A) almost everyone reaches the final stage on schedule, at the same age.
B) children in two-parent families develop through the stages faster than those from single-parent families.
C) first-born children develop through the stages faster than their later-born brothers and sisters.
D) almost everyone goes through the stages in the same order.