What is the correct hand placement for CPR on an adult?

The correct hand placement for CPR on an adult is at the nipple line because this position allows for effective compressions on the chest. When performing chest compressions, the hands should be positioned over the lower half of the sternum, which is roughly even with the nipple line. This placement ensures that the compressions are applied to the heart, facilitating blood circulation during cardiac arrest.

Effective CPR relies not only on the correct technique but also on the correct anatomical landmarks to maximize the force applied to the heart. Placing the hands too high or too low can decrease the efficacy of the compressions and potentially lead to injury.

The other options suggest placements that are either too low, which might result in ineffective compressions, or too high, where compressions could be directed more at the abdominal area rather than at the heart. Thus, positioning the hands at the nipple line ensures proper technique and is recognized as the standard for adult CPR.