Question

practice it
system of reinforcement in which only a portion of responses is reinforced
schedule of partial detachment
schedule of partial entrenchment
schedule of partial reinforcement
schedule of partial counterattack
schedule of partial offensive

Explanation:

In psychology, a schedule where only a portion of responses is reinforced is called a schedule of partial reinforcement. The other terms are not relevant in this context.

Answer:

C. schedule of partial reinforcement