medium · GMAT Verbal Reasoning
The city's air quality has improved significantly since the new emissions tax was implemented. Therefore, the tax is the primary cause of the reduction in local pollution.
Which of the following, if true, would most weaken the conclusion?
- A major coal-fired power plant just outside the city closed three months before the tax took effect.
- Air-quality monitoring equipment was upgraded shortly after the tax took effect, producing more precise readings.
- The tax was lower than many environmental groups had initially recommended.
- Neighboring cities that did not implement the tax saw no change in their air quality.
- Many local business owners have complained about the financial burden of the tax.
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