__ 9. Lev Vygotsky believed that children learn from working with others. He called this concept A. secure attachment. B. representational thought. C. imprinting. D. the zone of proximal development.

The correct answer is D. the zone of proximal development.<br /><br />Lev Vygotsky, a prominent psychologist, introduced the concept of the zone of proximal development (ZPD). This concept refers to the difference between what a child can do without help and what they can achieve with guidance and encouragement from a skilled partner. Vygotsky emphasized the importance of social interaction and collaboration in learning, suggesting that children learn best when they are working within their ZPD, with the support of more knowledgeable others.