Which of the Following Is the Best Example of a Partial

Multiple Choice

Which of the following is the best example of a partial schedule of reinforcement?

A) Every time he cries, Robert's mother picks him up.
B) Vickie has a tantrum every time her mother takes her to the grocery store because once or twice in the past her mother has given in and bought her candy to quiet her down.
C) Julie has come to expect that she will be paid for babysitting her little brother because this is what parents always do.
D) Jake has a terrible fear of spiders that his therapist has now diagnosed as a phobia.