In Reviews of Cross Cultural Research on Piaget's Sensorimotor Stage

In reviews of cross cultural research on Piaget's sensorimotor stage of development,Dasen and Heron (1981) and Werner (1979) conclude that

A) in many African cultures, children develop object permanence earlier than they do in most Western cultures.
B) in many Western cultures, children develop object permanence earlier than they do in most African cultures.
C) in many cultures, children do NOT experience a sensorimotor stage.
D) in sensorimotor development, there are more similarities across cultures than there are differences.