decreased cost of fuel production decrease in farm land available for food production increase in the consumption of fossil fuels increased carbon footprint from driving automobiles
I gave my students this multiple choice question: Ethanol is an alternative fuel made from corn. What is one of the unfavorable effects of using ethanol as a fuel?

Only one answer is correct among these 4 choices:
- decreased cost of fuel production
- decrease in farm land available for food production
- increase in the consumption of fossil fuels
- increased carbon footprint from driving automobiles

Could you tell me which one is correct?

decrease in farm land available for food production