Environmental

Polychlorinated biphenyls (PCBs) are most likely to be found in:

AOlder electrical equipment and transformers manufactured before 1979✓ Correct
BLead-based paint in pre-1978 homes
CUnderground radon deposits
DMunicipal water treatment chemicals

Explanation

PCBs are toxic industrial chemicals that were widely used in electrical equipment (transformers, capacitors) before being banned in 1979. They may be found in older industrial and commercial buildings.

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