Critical Reasoning: Although air pollution was previously thought to exist almost exclusively in our nation’s cities, the recent increase in the number of persons suffering from illnesses attributed to excessive air pollution leaves us no choice but to conclude that other, non urban areas are now affected. Which of the following, if true, would most seriously weaken the conclusion of the argument above?

A The nation's cities have seen a marked decrease in levels of air pollution

B The nation has experienced a sharp decrease in the number of people moving out of its cities

C Illnesses due to air pollution are among the least common causes of death to urban dwellers

D Many illnesses previously thought unrelated to air pollution are now considered to be caused by it.

Solution

Correct Answer: Option D

Solution

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