On the first day of kindergarten Mrs. Rose's class appears nervous. Mrs. Rose allows
the children to have free time to color and play with clay. Each day during the first
week of school, Mrs. Rose allows the children free time. By the end of the first week,
the children appear calm and enter the room with happy faces. For the children, the
kindergarten classroom has become the
A)Reinforcer
B)Conditioned stimulus
C)Unconditioned response
C)Conditioned response