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

Commercial 60 Hz alternating current is more hazardous than direct current or high-frequency AC because its frequency closely matches the natural pacemaker rhythms of the human heart, easily triggering ventricular fibrillation at lower current thresholds during marine electrical shock incidents.