Environmental
Polychlorinated biphenyls (PCBs) are a concern in older commercial properties primarily because they were used in:
AFloor waxes and carpet adhesives
BElectrical transformers and capacitors✓ Correct
CRoof shingles and exterior caulking
DPlumbing pipes and joint compounds
Explanation
PCBs were widely used in electrical equipment (transformers, capacitors, fluorescent light ballasts) before being banned in 1979 under the Toxic Substances Control Act (TSCA). Old electrical equipment in commercial buildings may still contain PCBs, requiring special handling and disposal.
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