Environmental

Polychlorinated biphenyls (PCBs) are most likely to be found in older properties as components of:

APlumbing pipes
BElectrical transformers, fluorescent light ballasts, and caulking✓ Correct
CInsulation in attics
DFoundation concrete

Explanation

PCBs were widely used before being banned in 1979. They are most commonly found in older electrical equipment (transformers, capacitors), fluorescent light ballasts, and as plasticizers in caulk, paint, and floor finishes. PCBs are toxic and require proper hazardous material handling.

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