Environmental

Asbestos is most hazardous when it is:

AIntact and undisturbed (friable condition)
BIntact and not releasing fibers (non-friable)
CDisturbed or damaged and releasing fibers (friable condition)✓ Correct
DFound in exterior insulation only

Explanation

Asbestos becomes hazardous when it is friable — disturbed or damaged so that fibers are released into the air and can be inhaled.

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