To me, the Answer to this problem is A. Crossing Gates.
D. Weight
People who weigh more will generally have more water present in their bodies. This water has a dilution effect on alcohol that is consumed, resulting in lower blood alcohol content. If two people consume the same amount of alcohol, the person who weighs more will generally have a lower blood alcohol content if other factors are equal.
Cogeneration is the process of taking a waste product or process and producing heat and generating electricity from it at the same time.
It could be collection of waste heat from the original generation of electricity or burning of biodiesel, ethanol or methane gas from sewer or cow dung. The only answer where electricity is using or creating heat and generating electricity power is C.
