GRE Reading Comprehension
When a driver is suspected of having had too much to drink, testing the driver's ability to walk a straight line gives a more reliable indication of fitness to drive than does testing the driver's blood-alcohol level.
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.
Correct Answer: B