Task: Question Answering
Input (English): Question: What is the name of the distance between what a child is capable of doing for himself and what he is capable of doing if an adult, or another more capable child, helps him ?: 
 Options:  <1> Scaffolding. <2> Self-regulation. <3> Tertiary circular reaction. <4> Near (or proximal) development zone. <5> Shared attention area.
Output (English): 4