___ year olds accounted for only 6.4 percent of the total number of drivers in the US but they made up 12 percent of all drivers involved in fatal crashes.

Question: ___ year olds accounted for only 6.4 percent of the total number of drivers in the US but they made up 12 percent of all drivers involved in fatal crashes.
A. Twenty to thirty
B. Fifteen to twenty
C. Thirty to forty

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Fifteen to twenty