Energy and environmental costs are built into all forms of mobility by mechanical means, but personal and political choices can
reduce the fuel and pollution "overhead" associated with a given level of mobility. In paragraph 4, the word overhead means A) saved energy B) operating costs C) interest on debt D) supply and demand
The context of the sentence and the surrounding sentences implies that the overhead is the overall cost of mobility. Most businesses have overhead such as rent, utilities, or other operating costs.
