Answer: Positive
Explanation:
Positive reinforcement is defined as process in which something is given or praising the person in form of reward when he/she performs any desired act .It helps in promoting and performing such acts more in future by the person through reinforcement stimulus.
According to the question, as Leah has completed her reading task as well as assignments, she is rewarding herself with movie treat so that she can promote her on-time reading function more in future.Thus, it is positive reinforcement example.
