Answer:
The answer is B. Intermittent.
Step-by-step explanation:
An intermittent or partial schedule of reinforcement consists of reinforcing the desired behavior only part of the time, in opposed to a continuous schedule, in which the desired behavior is reinforced every time it occurs. A continuous schedule of reinforcement is mostly used when the learning of the behavior begins, in the initial stages.
However, when the behavior has already been established, it is best to use an intermittent schedule of reinforcement to help in the maintenance of such behavior. The skill is reinforced only certain times to prevent extinction.