Question ID:PT61 S4 Q12 Passage:After the rush-hour speed limit on the British M25 motorway was lowered from 70 miles per hour (115 kilometers per hour) to 50 miles per hour (80 kilometers per hour), rush-hour travel times decreased by approximately 15 percent. Stem:Which one of the following, if true, most helps to explain the decrease in travel times described above? Correct Answer Choice:CChoice A:After the decrease in the rush-hour speed limit, the average speed on the M25 was significantly lower during rush hours than at other times of the day. Choice B:Travel times during periods other than rush hours were essentially unchanged after the rush-hour speed limit was lowered. Choice C:Before the rush-hour speed limit was lowered, rush-hour accidents that caused lengthy delays were common, and most of these accidents were caused by high-speed driving. Choice D:Enforcement of speed limits on the M25 was quite rigorous both before and after the rush-hour speed limit was lowered. Choice E:The number of people who drive on the M25 during rush hours did not increase after the rush-hour speed limit was lowered.