Editorialist: Additional restrictions should be placed on driver' s licenses of teenagers because teenagers lack basic driving skills. Even though drivers of age nineteen and younger make up only 7 percent of registered drivers, they are responsible for over 14 percent of traffic fatalities. Each of the following, if true, weakens the argument that teenagers lack basic driving skills EXCEPT: ['Teenagers cause car accidents that are more serious than those caused by others.', 'Teenagers tend to drive older and less stable cars than other drivers.', 'Teenagers and their passengers are less likely to use seat belts and shoulder straps than others.', 'Teenagers are likely to drive with more passengers than the average driver.']