How deeply should the sternum be depressed when applying chest compressions on an adult victim during CPR?

Correct Answer: Option A — 1-1/2 to 2 inches

Standard cardiopulmonary resuscitation (CPR) protocols for adults require compressing the sternum downward to a depth of 1.5 to 2 inches (4 to 5 cm) at a rate of 100 to 120 compressions per minute to effectively maintain artificial circulation.