The supporting claim that the author offers to support the argument is that A. Teenagers learn to drive better later by starting young.
It should be noted that a claim simply means the stance of an author regarding a topic or an issue.
According to the representative, raising the driving age will imply the raising of the level of safety on American roads.
In this case, the supporting claim that the author offers to support the argument is that teenagers learn to drive better later by starting young.
In conclusion, the correct option is D.
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