Which of the following, if true, best supports the claim made in the statement above? A. Not all observers will agree whether or not an individual has succeeded in walking a straight line. B. Because of genetic differences and variations in acquired tolerance to alcohol, some individuals suffer more serious motor impairment from a given high blood-alcohol level than do others. C. Tests designed to measure blood-alcohol levels are accurate, inexpensive, and easy to administer. D. More than half the drivers involved in fatal accidents have blood-alcohol levels that exceed the legal limit, whereas in less-serious accidents the proportion of legally intoxicated drivers is lower. E. Some individuals with high blood-alcohol levels are capable of walking a straight line but are not capable of driving safely.