The behavior modification employed on the child is Extinction.
Explanation:
Extinction is the removal of all stimulus associated with bad behavior.Taking away a child from his peers because he yells at them until he learns to interact without yelling and relate cordially and amicably with the peers explains Extinction.
In Extinction,while the child is away, he learns new behaviors and attitudes, forgets actions he/she is used to before due to isolation as such over the period of time the child tends to think differently and relate with peers without yelling because the child has been exposed/subjected to a life of solitude over a given period of time.
D because if you are trying to reduce the carbon footprint then using less coal or oil based energy would be best. plus using the solar panels will help because all you have to rely on is the sun and your own power bank for energy. there for leaving less of a carbon footprint.