**Core Concept**
The most common fracture in children is related to the **forearm**, specifically the distal end of the radius. This type of fracture is often seen in pediatric patients due to their higher bone density and elasticity, as well as their increased susceptibility to falls.

**Why the Correct Answer is Right**
The correct answer is related to the **distal radius fracture**, which is indeed the most common type of fracture in children. This is because children often fall onto an outstretched hand, causing a fracture at the distal end of the radius bone. The **wrist** and **forearm** are common areas for fractures in pediatric patients.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct location of the fracture.
**Option B:** This option is also incorrect as it is not the most common fracture in children.
**Option C:** Similarly, this option is incorrect as it does not correspond to the most common fracture in pediatric patients.
**Option D:** This option is incorrect because, although fractures can occur in this area, they are not the most common in children.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that **distal radius fractures** are common in children, and their treatment often involves closed reduction and immobilization.

**Correct Answer:** D. Supracondylar fracture of the humerus