Environmental

Polychlorinated biphenyls (PCBs) found in older building materials in West Virginia are a concern because they are:

AHighly flammable and present a fire risk
BProbable human carcinogens that persist in the environment✓ Correct
CRadioactive and require special disposal
DOnly hazardous when inhaled in very large quantities

Explanation

PCBs are probable human carcinogens that were widely used in electrical equipment and building materials before being banned in 1979. They are persistent organic pollutants that accumulate in living organisms and the environment.

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