Final answer:
Jane's supervisor was using extinction, which is the process in operant conditioning of decreasing a behavior by no longer providing the reinforcement that maintained the behavior.
Step-by-step explanation:
Jane's supervisor was using C) Extinction to eliminate the undesirable activity. Extinction in operant conditioning refers to the decrease in the likelihood of behavior when reinforcement is no longer presented. It differs from reinforcement, which aims to increase behavior, and from punishment, which aims to decrease behavior. Unlike positive or negative reinforcement where a stimulus is added or removed to increase a behavior, extinction involves no longer providing the reinforcement that maintained the behavior.
Examples of extinction include not laughing at a joke that was funny the first few times but has become repetitive, or not responding to a baby's crying when they are seeking attention and it's deemed they are not in distress. Over time, the behavior, in this case, the telling of the joke or the crying for attention, is likely to decrease and stop because it is no longer reinforced.