**Core Concept**
The recommended rate of chest compression during cardiopulmonary resuscitation (CPR) in adults is crucial for maintaining adequate circulation and perfusion of vital organs. This rate is based on the American Heart Association (AHA) guidelines, which aim to optimize the likelihood of successful resuscitation.

**Why the Correct Answer is Right**
The correct rate of chest compression is 100-120 compressions per minute. This rate is chosen to mimic the heart rate of a healthy individual and to prevent excessive myocardial fatigue. The AHA guidelines emphasize the importance of maintaining this rate to ensure effective circulation, particularly in the context of cardiac arrest. The optimal rate is achieved through a combination of proper training, equipment, and teamwork.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because rates lower than 100 compressions per minute may not provide sufficient circulation, potentially leading to inadequate perfusion of vital organs.
**Option B:** This option is incorrect because rates higher than 120 compressions per minute may result in excessive myocardial fatigue, potentially compromising the effectiveness of CPR.
**Option C:** This option is incorrect because rates of 50 compressions per minute are not sufficient to maintain adequate circulation and perfusion of vital organs.
**Option D:** This option is incorrect because rates of 150 compressions per minute may be excessive and may lead to myocardial fatigue.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the rate of chest compression during CPR should be maintained consistently throughout the resuscitation effort, with minimal interruptions, to maximize the effectiveness of CPR.

**Correct Answer: C. 100-120 compressions per minute.**