medium · LSAT Logical Reasoning
Environmentalist: Our city's air quality has improved since we implemented the new emissions standards for factories. Therefore, these standards are clearly effective.
Which of the following, if true, most seriously undermines this argument?
- Air quality improved by a comparable amount over the same period in nearby cities that adopted no such standards.
- Several small factories were forced to shut down for good because they could not afford the new standards.
- A number of factory owners have complained that the new emissions standards are simply too hard to monitor.
- The improved air quality also coincided with a clearly measured 10 percent drop in respiratory-related hospital visits.
- Air quality in the city had been gradually but steadily worsening for many years before these emissions standards took effect.
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