Environmental

Polychlorinated biphenyls (PCBs) are found in some older commercial and industrial properties in:

AInsulation and roofing materials only
BElectrical transformers, capacitors, and some older building materials like caulk✓ Correct
CMunicipal water supply systems
DNatural soil deposits in Massachusetts

Explanation

PCBs were widely used in electrical equipment (transformers, capacitors) and some building products (caulk, paint, floor finish) before being banned in 1979. Their presence requires careful handling and potentially costly remediation.

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