**Core Concept**
The wrist is formed by the articulation of the distal end of the radius bone with the proximal row of carpal bones. This joint is known as the radiocarpal joint. The **radiocarpal joint** allows for flexion, extension, abduction, and adduction movements of the wrist.

**Why the Correct Answer is Right**
The **scaphoid bone** is the carpal bone that articulates with the radius. It plays a crucial role in the stability and movement of the wrist joint. The scaphoid bone has a unique, boat-like shape and is located on the thumb side of the wrist, allowing it to articulate with the distal end of the **radius**.

**Why Each Wrong Option is Incorrect**
**Option A:** Lunate bone, while it does articulate with the radius, is not the primary bone that does so in a way that is distinctively recognized for this function.
**Option B:** Triquetrum bone articulates with the ulna via the triangular fibrocartilage complex, not directly with the radius.
**Option D:** Other carpal bones do not have a direct, primary articulation with the radius.

**Clinical Pearl / High-Yield Fact**
The scaphoid bone is the most commonly fractured carpal bone, often due to a fall onto an outstretched hand, which puts excessive force on the scaphoid.

**Correct Answer:** C. Scaphoid bone