Answer:
a. extinction
Step-by-step explanation:
Extinction: In operant conditioning, extinction is described as a process of removing a particular reinforcement that maintains a behavior for a period.
In other words, it refers to a process of sloe or gradual weakening of a specific conditioned response resulting in disappearing or decreasing behavior. In short, the conditioned behavior declines after the removal of reinforcement.
According to the principles of operant conditioning, Lori's son decreased crying is due to extinction.