Environmental
Polychlorinated biphenyls (PCBs) are commonly found in older buildings in:
AInsulation and roofing materials
BElectrical transformers, fluorescent light ballasts, and caulking✓ Correct
CPlumbing pipes and fixtures
DConcrete foundations
Explanation
PCBs were widely used in electrical equipment, fluorescent light ballasts, and caulking materials before their manufacture was banned in the U.S. in 1979 due to their toxicity and persistence in the environment.
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