Every time Erwin cried, his father would immediately pick him up and he would stop crying. Now almost as soon as Erwin's dad gets home from work, he picks Erwin up. Based on what is known about operant conditioning, you should conclude that for Erwin's father, when the crying stopped it acted as:
a. a positive reinforcer for picking Erwin up
b. a conditioned stimulus for picking Erwin up
c. a negative reinforcer for picking Erwin up
d. an unconditioned stimulus for picking Erwin up
C
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