Critical Reasoning (CR) | In 1974 the speed limit on highways in the United States

In 1974 the speed limit on highways in the United States was reduced to 55 miles per hour in order to save fuel. In the first 12 months after the change, the rate of highway fatalities dropped 15 percent, the sharpest one-year drop in history. Over the next 10 years, the fatality rate declined by another 25 percent. It follows that the 1974 reduction in the speed limit saved many lives.

Which one of the following, if true, most strengthens the argument?

(A) The 1974 fuel shortage cut driving
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