Which of the following currents can cause a tetanic contraction that immobilizes a victim?

High voltage alternating current (AC) is the type of current most likely to cause a tetanic contraction that can immobilize a victim. Tetanic contractions occur when the muscle fibers contract continuously without relaxation, which can happen when a strong enough electrical current passes through the body.

High voltage AC can produce a powerful and sustained muscular contraction because it alternates its direction and can penetrate body tissues more effectively than other forms of current. This allows it to stimulate motor neurons and lead to involuntary muscle contractions, sometimes so severe that they can cause the person to be unable to release an object or free themselves from the source of the current.

In contrast, direct current (DC) can also cause muscle contractions, but these contractions are more likely to be intermittent rather than tetanic and may not result in sustained immobility. Low voltage AC does not typically provide sufficient current strength to induce such powerful contractions. Static electricity generally does not produce the sustained effects on muscle contraction that alternating or direct currents do, as it involves a brief discharge rather than a continuous current flow.