Environmental

Polychlorinated biphenyls (PCBs) in Arizona real estate are most commonly found in:

ADrinking water systems
BOld electrical transformers and capacitors in commercial and industrial buildings✓ Correct
CResidential interior paint
DNew construction materials

Explanation

PCBs were used as insulating fluids in electrical transformers and capacitors until banned in 1979. They are a concern in older commercial/industrial buildings and electrical equipment and are highly persistent environmental contaminants.

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