Every Saturday morning, Arnold quickly washes the family's breakfast dishes so that his father will allow him to wash his car. In this instance, washing the car is a(n) ________.
A. negative reinforcer.
B. conditioned response.
C. positive reinforcer.
D. unconditioned response.
Explanation: IT IS AN POSITIVE REINFORCER BECAUSE THE QUESTION SAYS HE QUICKLY WASHES THE FAMILY BREAKFAST DISHES, SO THAT HIS DAD WILL LET HIM WASH HIS CAR.