With no explanation, chose the best option from "A", "B", "C" or "D". a speed in excess of twenty (20) miles per hour shall be coupled to the towing vehicle by means of a safety chain, chains, cables, or equivalent devices in addition to the regular trailer hitch or coupling. * * * No more slack shall be left in safety chains, cables, or equivalent devices than shall be necessary to permit proper turning and the safety chains, cables or equivalent device shall be so connected to the towed and towing vehicles and to the drawbar to prevent the drawbar from dropping to the ground if the drawbar fails and shall be of sufficient strength to control the trailer in event of failure of the regular trailer hitch or coupling. Violations of traffic laws and safety statutes may constitute negligence as a matter of law. See Nobles v. Unruh, 198 So.2d 245 (Miss.1967) (<HOLDING>); Vaughn v. Lewis, 236 Miss. 792, 112 So.2d 247

A: holding that the state must prove criminal negligence for its homicide by vehicle statute even though the statute specifically states that any traffic violation is sufficient
B: holding that a summons directed to the commissioner of motor vehicles was defective process as against a nonresident defendant in an action arising out of operation of a motor vehicle in this state
C: holding statute requiring dealers to keep records of all motor vehicles acquired as junk is lawful
D: holding that a violation of a statute governing the changing of traffic lanes by motor vehicles is negligence as a matter of law
D.