Passage Summary: The government lowered the speed limit, and fewer people died on the road last year. Because of this, the author concludes that the speed limit change actually caused the safety improvement.

Conclusion: Lowering the speed limit is capable of decreasing the number of traffic deaths.

Reasoning: There was a correlation between the reduction of the speed limit and a decrease in highway fatalities over the following year.

Analysis: This is a classic 'correlation equals causation' trap. The argument assumes that no other factor—like better weather, safer car technology, or less overall driving—was responsible for the drop in deaths. To be valid, the argument needs to assume that the decrease wasn't just a coincidence or caused by something else entirely. Look for an answer that addresses the exclusion of alternative causes or confirms that the speed limit was the primary driver of the change.