What is the purpose of a clincher sentence?

What must a clincher sentence have?

When I first moved here from Michigan, I didn't know anybody at this high school. At first, I felt very lonely and left out. I didn't even get hungry at lunchtime since I knew I would have to eat alone. One day, I met a girl, and I talked to a boy in my science class. We became friends. Now, I have friends with whom I can talk during lunch and after school. As a result, I'm not lonely any more because I have two friends. Which sentence is the CLINCHER sentence?

Transportation today can take many forms. Typicall, most people prefer the automobile. With the emphasis on conserving gas, motorcycles, mopeds, or bicycle have become preferred by some as their main souce of transportation. Trains or subjways are other sources of transporation. Recently, people have begun to walk or jog as a form of transporation. In conclusion, whether it's on wheels, rails, or legs, transportation plays an impotant role in peoples' lives.

What type of clincher sentence is it? In conclusion, all of General Motors' plants had to be closed down.

What type of clincher sentence is it? As a result of all these financial woes, he decided to sell his farm.

What type of clincher sentence is it? Thus, one can see why a cat watches a bird closely before it pounces.

What type of clincher sentence is it? In review, a divorce isn't final until the case goes to court, the settlement is reached, and custody fo the children is decided.

What type of clincher sentence is it? To conclude, in order to avoid these four problems, a retail business has to take inventory of its products at least once a year.

What type of clincher sentence is it? Boots, jeans, kerchiep, and hat are, in summary, the main things people have to wear if they want to be western cowboys or cowgirls.

Which of the following is a concluding transition?