Ethanol is produced by alcoholic fermentation of the glucose in corn or other plants.
Plants use the sun's energy to transform carbon dioxide gas and water into a sugar called glucose.
Ethanol production is reliant on the sun's energy.
Production of ethanol is dependent  on 
(a) the environment
(b) the sun's energy
(c) rubbing alcohol
(d) Movement of an air mass
(e) Rayleigh scattering
(f) agriculture
(g) heat produced
(h) vinegar