What is the basic method of CPR for an adult on a layperson scene?

• A. Only give breaths; no compressions
• B. Use AED only
• C. Chest compressions at about 100–120 per minute with rescue breaths if trained (or hands-only CPR if not trained).
• D. Chest compressions at 40 per minute

Answer: (C)

The key idea is that a bystander should prioritize chest compressions at a brisk pace and add rescue breaths if you’re trained and comfortable doing so. This approach keeps blood flowing to vital organs while help is on the way. The best choice specifies compressions at about 100–120 per minute and allows rescue breaths if you’ve been trained; if you’re not trained or not confident, you can do hands-only CPR, which is still performed at the same rapid rate.

Why this fits best: compressions create the circulation needed to sustain life, and breaths can support oxygen delivery when you’re able to provide them. Other options miss the critical need for circulation, delay by focusing only on breaths, rely on an AED in isolation, or describe a rate that’s far too slow to be effective.