Patrick is participating in a toilet training program. For the first several sessions his trainer, Moira, prompted him to go to the toilet and she delivered edibles and praise each time he correctly voided. Eventually, Moira was able to fade prompts as Patrick began to go to the toilet and void independently. Which of the following BEST describes this process?
A . establishing operation
B . negative reinforcement
C . shifting from respondent to operant behavior
D . transfer of stimulus control
Answer: D