The correct option is
A Cardiopulmonary resuscitation
- CPR means C - Cardio P - pulmonary R - Resuscitation
- CPR is done by pressing (neither gently nor too heavily) with your palms at the spot 2-3 inches away from the place where the ribs end (chest bones).
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1069091/original_cpr-chest-compressions-being-performed-on-unconscious-man.jpg)