Which of the earth-system scientist's roles is best illustrated by this paragraph? Emission testing is required by federal law in areas that have had problems meeting health-based air quality standards. Such areas typically include industrialized urban areas and large cities. Supporters of this practice argue that all citizens benefit because vehicles with malfunctioning pollution control systems are identified. They also cite government data showing average failure rates of 10%. Critics of the testing argue that those data are heavily influenced by older vehicles that fail 30% of the time, and vehicles less than 5 years old fail less than 1% of the time. A law has been placed on the ballot to stop testing for vehicles less than 5 years old.

A. Alerting the public of natural hazards
B. Use of earth resources
C. Health of the environment
D. Informing society