Final answer:
The best term for Juno's system of giving points to her children for not fighting is a 'token economy,' which is an effective behavior modification tool based on operant conditioning. Therefore correct option is B
Step-by-step explanation:
The best term for the example where Juno gives her children points for every 15 minutes they don't fight, which can be exchanged for rewards like screen time and candy, is a token economy. This behavioral management system uses tokens or points as secondary reinforcers, which children earn for displaying appropriate behavior and can later exchange for preferred items or privileges. This method is based on operant conditioning, specifically positive reinforcement, which has been found effective in various settings, including schools and rehabilitation facilities. A token economy helps in modifying behavior by reinforcing desired behaviors and reducing unwanted ones.