Environmental

Polychlorinated biphenyls (PCBs) are most likely found in:

AModern HVAC equipment
BElectrical transformers and equipment manufactured before 1980✓ Correct
CNew construction lumber
DLead paint in homes built after 1978

Explanation

PCBs were used in electrical equipment (transformers, capacitors) and some building materials until they were banned in 1979. They are carcinogenic and persist in the environment.

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