Environmental

In Tennessee, 'polychlorinated biphenyls' (PCBs) are a concern primarily in:

AModern residential construction
BOlder electrical equipment, transformers, and certain industrial sites✓ Correct
CAgricultural soil amendments
DNew commercial construction materials

Explanation

PCBs were used in electrical equipment, especially transformers, and certain industrial applications before being banned. Their presence on older industrial or utility properties poses significant environmental and health risks.

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