Sam and his mother are building a wooden box, using a hammer and nails. If Sam's mother would like to teach him how to hammer a nail, which of the following behaviors would NOT be considered high-quality social scaffolding?
a. hammering all of the nails in while Sam watches
b. holding the nail while Sam hammers
c. explaining to Sam how to hold the hammer
d. demonstrating to Sam how to hammer the nail into the board

a. hammering all of the nails in while Sam watches                      

Explanation:

Scaffolding: In psychology, the term scaffolding is defined as an "instrumental technique" whereby a specific teacher gives individualized support to his or her student or learner via incrementally improving the student's or learner's capability to form prior knowledge. The phenomenon of scaffolding can be utilized in various areas and throughout different grade and age levels.

The concept of scaffolding was proposed by Lev Vygotsky and is also referred to as “Vygotsky scaffolding”.

the answer your looking for is c. : )