Vygotsky's Zone of Proximal Development Is

Vygotsky's zone of proximal development is

A) the notion that children should be given tasks so simple they can accomplish them on their own.
B) the notion that children capable of X on their own may be capable of X + Y with help from a competent adult or older child.
C) the notion that if a child is given a difficult task, s/he will accomplish it even if they are at first incapable of completing it.
D) the notion that children will learn only when they are ready to learn.