【单选题】According to the passage, it is true that ______.
A．in the late 19th century in the United States the dividing line between adolescence and adulthood no longer existed
B．no one can marry without the permission of his parents until the age of twenty-one
C．one is considered to have reached adulthood when he has a driver's license
D．one is not free from the restrictions of child labor laws until he can join the army
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