Multiple choice

Nonprescription sunglasses shield the wearer's eyes from damaging ultraviolet sunlight. Squinting, however, provides protection from ultraviolet rays that are at least as good as the protection from nonprescription sunglasses. There is, therefore, no health advantage to be gained by wearing nonprescription sunglasses rather than squinting.

Which of the following, if true, most seriously weakens support for the conclusion above?

  1. Many opticians offer prescription sunglasses that not only screen out ultraviolet Sunlight but also provide corrective vision.

  2. Some nonprescription sunglasses provide less protection from ultraviolet sunlight than does squinting.

  3. Squinting strains facial muscles and causes headaches and fatigue.

  4. Many people buy sunglasses because they feel that sunglasses are fashionable.

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Headaches and fatigue are health problems that would weaken the argument that squinting is just as good as wearing sunglasses.

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