At a minimum threshold, how many milliamps of current through the body produces a condition where most people would experience respiratory paralysis and be unable to breathe while still in contact with the energized conductor?

Correct Answer: Option C — 30 mA

Alternating current in the range of 30 mA passing through the human body is the critical threshold where respiratory paralysis occurs. This level of current causes involuntary contraction of the respiratory muscles, preventing breathing during contact, and is a key design parameter for marine ground fault protection systems.