The Zone of Proximal Development Represents the Difference Between a Child's

The zone of proximal development represents the difference between a child's developmental level determined by solving problems

A) that are practical and a child's developmental level determined by solving problems that are abstract.
B) on paper and a child's developmental level determined by solving problems with physical materials.
C) independently and a child's potential developmental level determined by solving problems with guidance.
D) verbally and a child's developmental level determined by solving problems mentally.