**Core Concept**
The rule of nines is a method used in emergency medicine to estimate the total body surface area (TBSA) affected by a burn. This calculation helps in determining the severity of the burn, assessing the risk of infection and shock, and guiding fluid resuscitation.

**Why the Correct Answer is Right**
The rule of nines was first proposed by Dr. Charles T. Daniel in 1954, but it was popularized by Dr. Francis Heyl in 1956 and is often attributed to him. The rule divides the body into areas that are approximately 9% of the total body surface area, making it a simple and effective method for estimating TBSA in burn patients. This method helps in calculating the amount of fluid required for resuscitation and predicting the risk of complications.

**Why Each Wrong Option is Incorrect**
**Option A:** Dr. Charles T. Daniel - Incorrect because while Dr. Daniel did propose the initial concept, he is not credited with popularizing the rule of nines.
**Option B:** Dr. Francis Heyl - Incorrect because Dr. Heyl is often credited with popularizing the rule, but he is not the one who initially proposed it.
**Option C:** Dr. Robert McLean - Incorrect because there is no notable reference to Dr. Robert McLean in the context of the rule of nines.

**Clinical Pearl / High-Yield Fact**
The rule of nines is a quick and easy way to estimate the TBSA affected by a burn, but it may not be accurate in patients with irregular body shapes or burns that affect multiple areas simultaneously. It is essential to use clinical judgment and other methods to confirm the estimate.

**Correct Answer:** C.