Studies have shown that an automobile that runs on a blend of 85% ethanol/15% gasoline gets better mileage than an otherwise similar car equipped with a gasoline engine. Many American legislators have concluded that an increase in tax incentives for ethanol production would lessen our dependence on foreign oil.
Which of the following, if true, casts the most doubt upon the validity of the legislators` conclusion?
premise1: automobiles on blend give better mileage.
legislatures conclusion: increasing incentive for ethanol PRODUCTION would LESSEN DEPENDENCE.
a) 1.5 gallons of oil makes 1 gallon of ethanol ( production needs oil. Dependence on gasoline for production exists. ) => hold
b) out of scope
c) retrofitting expensive-> might deter people from using such cars-> no demand for mix -> no supply => dependence continues => hold
d)out of scope
e)out of scope
comparing A and C.
A. directly weakens as for making ethanol you do need oil. ! gallon is consuming more of oil. Dependence is actually increasing.
C. talks about retrofitting. what about new cars ? people might just buy new cars that run on mix.In the long run might decrease dependence .
Choose A.
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