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.
The reason for this answer is because the passage/article explains how the Smokey Bear campaign had helped prevent fires that are caused by human carelessness.
