Which of the Following Would Define the Highest Point in a Child's

Multiple Choice

Which of the following would define the highest point in a child's zone of proximal development, according to Vygotsky?

A) The problem is too hard for the child to solve, even with help.
B) The child can solve the problem with no help from anyone.
C) The child can solve the problem, but only if someone helps with the solution.
D) The child can solve the problem without help 50% of the time.