Betty Was a 22-Month-Old Child with a Lung Disease Treated

Betty was a 22-month-old child with a lung disease treated by a frightening Bennett machine.Betty was gradually introduced to the parts of the machine while she was warm, had just been fed, and was being held.The parts of the machine were brought closer to the child and were put together ready for use while the child was comforted.The therapy used was

A) differential reinforcement.
B) systematic desensitization.
C) in vivo exposure.
D) flooding therapy.