Answer:
positive reinforcement
Explanation:
Positive reinforcement is a type of positive consequences to the action, endorsing stimuli. It happens when someone is giving a type of award whenever the subject performed the required action. In this way, a person starts connecting the action with the endorsement and reward, so they will start performing it more willingly and more often.
It can be given in the form of praise or a type of gift.
In this case, Dr. Sardis chose to give points for the involvement of his students for them to speak up and engage in the discussion on the class more often.
