Question ID:PT61 S2 Q21 Passage:A government study indicates that raising speed limits to reflect the actual average speeds of traffic on level, straight stretches of high-speed roadways reduces the accident rate. Since the actual average speed for level, straight stretches of high-speed roadways tends to be 120 kilometers per hour (75 miles per hour), that should be set as a uniform national speed limit for level, straight stretches of all such roadways. Stem:Which one of the following principles, if valid, most helps to justify the reasoning above?  Correct Answer Choice:EChoice A:Uniform national speed limits should apply only to high-speed roadways. Choice B:Traffic laws applying to high-speed roadways should apply uniformly across the nation. Choice C:A uniform national speed limit for high-speed roadways should be set only if all such roadways have roughly equal average speeds of traffic. Choice D:Long-standing laws that are widely violated are probably not good laws. Choice E:Any measure that reduces the rate of traffic accidents should be implemented. 