A child is struggling to learn how to read ? His teacher helps him by using various word recognition strategies and after a few weeks he is able to read. This difference between what he can do without help and what he can do with help is called as ?

Correct option is C

Zone of proximal development
The Zone of Proximal Development (ZPD) is a concept developed by Soviet psychologist Lev Vygotsky. It refers to the difference between what a learner can do without help and what they can achieve with guidance and encouragement from a skilled partner. In this case, the child's ability to read with the teacher's assistance is within his ZPD. The teacher's support and the strategies provided are acting as "scaffolding," a temporary support mechanism to aid learning. The ZPD is crucial for understanding how learning occurs and is a central concept in educational psychology.