Question

a reinforcement schedule is used to effectively ______ a behavior. stop reduce extinguish alter

Explanation:

In behavioral psychology (a subfield of Social Science, specifically Psychology), a reinforcement schedule is used to modify or change (alter) a behavior. Reinforcement is about increasing or shaping behavior, and "alter" fits as it means to change. "Stop", "reduce", and "extinguish" are more related to decreasing or eliminating behavior, which is more associated with punishment or extinction, not reinforcement.

Answer:

D. alter