With all other factors considered equal (such as voltage, conducting path through the body and the duration of contact), contact with an energized electrical system conductor of which system type would produce the most damaging effect?

Correct Answer: Option B — 60 Hz AC systems

Industrial standard 60 Hz alternating current is significantly more hazardous than direct current or high-frequency AC because it readily induces ventricular fibrillation at lower current thresholds due to cardiac cycle synchronization.