Peter Is Taking His Little Brother Out Trick-Or-Treating for the First

Multiple Choice

Peter is taking his little brother out trick-or-treating for the first time.For the first few houses,Peter has to tell his little brother to say,"Trick or treat" to be given candy.After that,Peter notices that his little brother says it as soon as a door is open.In this example,the treat that Peter's brother receives is a ___.

A) conditioned response
B) negative reinforcer
C) positive reinforcer
D) conditioned stimulus