Answer:
c. structural-functional theory
Step-by-step explanation:
This theory views society from the macro point of view. Here it is assumed that society is an organism with different parts working together to keep stability and achieve progress. Structural functionalism looks at social structure and function of a complex society hence the name"structural functionalism"
From this, we can easily relate with statement in the above statement assuming that formal education plays it's role while informal education plays a different important role.