Answer:
Praise her for only some of her completed assignments.
Step-by-step explanation:
Operant conditioning: In psychology, the term "operant conditioning" was proposed by a psychologist named B. F. Skinner as a way of explaining the study that has been done by Ivan Pavlov on laboratory dogs.
Operant conditioning is also referred to as instrumental conditioning and is described as one of the different types of "associative learning processes" according to which the "strength" of a specific behavior is being modified or altered via punishment or reinforcement.
In the question above, Mr Webber would praise her for only a few completed assignments.