How quickly should chest compressions be administered?

Chest compressions should be administered at a rate of 100 to 120 compressions per minute during CPR, which translates roughly to compressions every half second to two-thirds of a second. While the choices provided don't reflect the standard guidelines directly, the choice indicating "every second" is the most aligned with the intended rhythm, as it approximates the frequency of compressions that is necessary to maintain blood circulation effectively in a cardiac arrest scenario.

This frequency is critical because a higher rate of compressions contributes to a more effective blood flow to the heart and brain, which is essential for increasing the chances of survival. It's important to maintain this optimal compression rate while also ensuring the depth and full recoil of the compressions, as this aids in maximizing the effectiveness of the CPR being administered.