Environmental

Polychlorinated biphenyls (PCBs) in Connecticut commercial buildings were most commonly used in:

ACarpeting and flooring
BElectrical transformers and fluorescent light ballasts✓ Correct
CRoofing materials
DInterior paint

Explanation

PCBs were widely used in electrical equipment, particularly transformers and older fluorescent light ballasts, until they were banned by the Toxic Substances Control Act in 1979.

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