Environmental

PCBs (polychlorinated biphenyls) are most commonly found in older buildings in:

ARoof shingles
BElectrical transformers and fluorescent light ballasts installed before 1979✓ Correct
CFoundation concrete
DCopper plumbing

Explanation

PCBs were widely used in electrical equipment (transformers, capacitors, fluorescent light ballasts) before being banned in 1979. Buildings with pre-1979 electrical equipment may contain PCB hazards.

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