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The weakness of green fuels is that ____.

A they require a lot more work to produce
Explaination
Many green fuels require more work to produce than conventional fuels. The passage states “producing natural gas is a much more labor-intensive process than producing an equal amount of conventional gasoline. Producing natural gas also involves burning fossil fuels.”
B they must be transported greater distances
C burning them releases fossil fuels
D they are not as abundant as conventional fuel