Final answer:
Diamond's son is resistant to the extinction of his whining behavior due to previously being reinforced on a variable-ratio schedule, implying that it will likely take a long time for the behavior to be extinguished. Therefore the correct answer is A) It will likely take a long time for Diamond to extinguish her son's whining.
Step-by-step explanation:
The scenario with Diamond and her son revolves around the psychological concept of extinction in operant conditioning, which refers to the gradual decrease in a learned behavior when it is no longer reinforced. Since Diamond's son was inconsistently reinforced for his whining behavior—approximately one out of every four times—it is likely that it will take a long time for Diamond to extinguish her son's whining behavior. This is due to the reinforcement schedule known as a variable-ratio schedule which tends to create a high and persistent level of response, making the behavior more resistant to extinction. Hence, the correct answer is A) It will likely take a long time for Diamond to extinguish her son's whining.