B．To tell us saying hello can boost productivity.

　　C．To prove that environments influence friendliness.

　　D．To tell us saying hello is a form of universal health insurance.

　　B

　　The parents of a troubled teen may feel unsure as to whom to turn to in order to find help for their child. They may feel as if they have exhausted all of their options, and sometimes they are on the verge of giving up. But there is hope. Schools for troubled teens offer discipline and in some cases, drug treatment programs that can provide important life skills, and more importantly, a fresh start.

　　The following is a list of the most effective types of schools for troubled teens. Not every facility is a match for every child, but by knowing the differences between them, parents can make a better educated decision about where to send their teenagers.

　　Boarding Schools

　　When a child is unable to deal with the relative freedom of a standard school day, boarding schools might be a good choice. At boarding schools, the child lives in a dorm setting, where almost every minute of the day is scheduled by school administrators.

　　Treatment Centers

　　When a teenager has an addiction to drugs or alcohol, a residential center that specializes in young people is an outstanding way to help them break the cycle of addiction. Treatment centers feature individual and group counseling to help identify the root causes of the drug problem and help develop the life skills needed to stay clean when the program is over.

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