Environmental

Polychlorinated biphenyls (PCBs) are most likely to be found in Virginia commercial buildings constructed before:

A1950
B1970
C1980✓ Correct
D1990

Explanation

PCBs were commonly used in electrical equipment (transformers, capacitors), caulking, and other materials before being banned in 1979. Commercial buildings built before 1980 may contain PCB-containing materials.

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