Elsie's Mail Arrives at the Same Time Every Day

Multiple Choice

Elsie's mail arrives at the same time every day.For two weeks, while Elsie was waiting for her tax refund, she kept looking out the window to see if the mail had arrived.Based on what is known about schedules of reinforcement, you should conclude that Elsie's behavior of "watching for the mail" was being reinforced based on a:

A) fixed-ratio schedule
B) variable-ratio schedule
C) fixed-interval schedule
D) variable-interval schedule