Question

which of the following is not an impact of using gasoline mixed with ethanol instead of pure petroleum - based gasoline?
decreases cost of fuel
reduces dependency on petroleum
increases smog
decreases acid rain

Explanation:

Ethanol - gasoline blends generally reduce smog as ethanol burns more cleanly than pure petroleum - based gasoline. They can decrease fuel cost due to ethanol being cheaper in some cases, reduce petroleum dependency as it's a renewable component, and decrease acid rain as they emit less sulfur and nitrogen oxides.

Answer:

C. increases smog