Environmental

Polychlorinated biphenyls (PCBs) were commonly used in older Massachusetts commercial buildings as:

AInsulation material in walls
BElectrical insulating fluid in transformers and fluorescent light ballasts✓ Correct
CA foundation waterproofing material
DA fire-retardant coating on wood

Explanation

PCBs were widely used in electrical equipment, including transformers and fluorescent light fixture ballasts, in commercial buildings before being banned in 1979. They are hazardous and require special disposal.

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