Janet has almost finished painting a neighbor's house,at which time she'll be paid $2000. The fact that she is increasingly unlikely to quit painting as she nears completion of the job best illustrates that operant behavior is strongly influenced by ________ reinforcers.

A) primary
B) negative
C) immediate
D) partial

The fact that Janet is increasingly unlikely to quit painting as she nears completion of the job suggests that she is being strongly influenced by immediate reinforcers, which in this case is the $2000 payment she will receive once the job is done. Primary reinforcers refer to innate rewards such as food, water, and sexual stimulation. Negative reinforcement involves the removal of an unpleasant stimulus to increase the likelihood of a behavior. Partial reinforcement involves reinforcing a behavior only some of the time, which can actually increase the persistence of the behavior. However, none of these concepts fully explain Janet's behavior in this scenario.