Answer:
(C) depriving the subject of some desirable stimulus item for a period of time
Step-by-step explanation:
Operant conditioning is a method of learning which occurs through reward and punishment of a behavior. This question talks about the motivational state of the subject, and option (c) defines the positive punishment- which says that people are being motivated to do something when they want to get something they like. And for that, it's necessary to note what are the likes and dislikes of a person, and you have to take that away for which they are being motivated to get.