All but Which of the Following Are Examples of Operant

All but which of the following are examples of operant conditioning in behavioral therapy?

A) Dr. Angelino instructs teachers to use time-out as punishment when children with ADHD misbehave.
B) Dr. Barbarino teaches Bob and Judy to use a reward system when their daughter behaves in a desirable way.
C) Dr. Chang develops a token economy for use with residents of a mental hospital.
D) Dr. Dorian uses a nausea-inducing drug with his client Eduardo, who suffers from alcoholism.
E) Dr. Eggleston teaches Edwina to withdraw attention when her child misbehaves.