**Core Concept**
Diene's phenomenon refers to the radiographic appearance of a fracture line that is curved or S-shaped, typically seen in long bones. This phenomenon is a result of the interplay between the fracture line and the surrounding soft tissues, which can cause the fracture to appear more complex than it actually is.

**Why the Correct Answer is Right**
Diene's phenomenon is a result of the biconcave shape of the bone ends, which can cause the fracture line to be displaced and appear more complex. This occurs because the bone ends are concave, and the fracture line follows the curvature of the bone, resulting in an S-shaped appearance on radiographs. The surrounding soft tissues, such as muscles and ligaments, can also contribute to the displacement of the fracture line, making it appear more complex than it actually is.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because Diene's phenomenon is not typically seen in short bones, such as those in the hands or feet.
**Option B:** Incorrect because Diene's phenomenon is not a result of the type of fracture, such as a transverse or oblique fracture.
**Option C:** Incorrect because Diene's phenomenon is not a result of the location of the fracture, such as a fracture in the shaft of the bone.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that Diene's phenomenon can be a challenging radiographic finding to interpret, and a thorough understanding of the underlying anatomy and fracture mechanics is crucial for accurate diagnosis.

**Correct Answer:** C. Long bones.