**Core Concept**
The size of a burn is often estimated using the "rule of nines" or the "palm rule." The palm rule estimates the size of a burn based on the surface area of the palm, with the surface area of the palm being approximately 1% of the total body surface area (TBSA).

**Why the Correct Answer is Right**
The surface area of the palm is used as a reference point to estimate the percentage of burns. The child's burn corresponds to the size of his palm, which is approximately 1% of the TBSA. This is a simple and practical method for estimating the size of a burn, especially in emergency situations.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not provide any basis for the estimate, and the percentage of burns is not accurately represented.
* **Option B:** This option is incorrect because it does not take into account the size of the burn in relation to the palm.
* **Option C:** This option is incorrect because it is a general statement and does not provide a specific percentage of burns.
* **Option D:** This option is incorrect because it is a different method for estimating the size of a burn, and the percentage of burns is not accurately represented in this option.

**Clinical Pearl / High-Yield Fact**
The "rule of nines" is another method for estimating the size of a burn, which divides the body into areas that are approximately 9% of the TBSA. However, the palm rule is a simpler and more practical method for estimating the size of a burn, especially in children.

**Correct Answer:** . 9%