Why is information about levels of hydrocarbons, CO, and CO2 most likely required in the inspection report?

Why is information about levels of hydrocarbons, CO, and CO2 most likely required in the inspection report?
A . Gasoline companies lobby in favor of the emissions report.
B . Most drivers insist on knowing this information.
C . Foreign cars in the United States have different safety standards.
D . The state government regulates vehicle air pollution standards.
E . The state government regulates vehicle speed limits.

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Answer: D