Environmental
Polychlorinated biphenyls (PCBs) are most likely found in:
ANew construction materials manufactured after 2000
BOlder electrical transformers, caulking, and some building materials manufactured before 1979✓ Correct
CModern plumbing fixtures
DRadon mitigation systems
Explanation
PCBs were used in electrical equipment, caulk, paints, and other products until banned in 1979. Older properties may contain PCBs, which are toxic and require careful management.
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