medium · GMAT Verbal
A province introduced a graduated licensing law in 2023 requiring new drivers under 21 to complete 50 supervised hours before driving unsupervised. In 2024, the RATE of crashes per 1,000 licensed drivers under 21 fell by 30% compared to 2022. Transportation officials conclude that the graduated licensing law caused the drop in the under-21 crash rate.
Which of the following, if true, most strengthens the officials' conclusion?
- The total number of licensed drivers under 21 increased between 2022 and 2024.
- Crash rates for drivers over 21 in the same province also declined slightly between 2022 and 2024.
- A comparable province without the law saw its under-21 crash rate stay flat over the same period.
- Vehicles sold in the province after 2023 were, on average, equipped with more advanced collision-avoidance technology than vehicles sold before 2023.
- The 50 supervised hours required under the law are typically completed within six months of a new driver's permit being issued.
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