Phase at which a child can master a task if given appropriate help and support is called?

Phase at which a child can master a task if given appropriate help and support is called?
(a) Action zone
(b) Zone of proximal development
(c) Zone of maturation
(d) Active zone
✅ Answer: (b) Zone of proximal development
Explanation: Vygotsky’s ZPD is the range where a child can perform a task with guidance but not yet independently.