**Core Concept**
The question tests knowledge of **wrist anatomy** and **carpal bone dislocations**, specifically which bone is most prone to dislocation due to a fall on an outstretched hand. This involves understanding the **kinematics of the wrist** and how forces are distributed across the carpal bones during such injuries.

**Why the Correct Answer is Right**
The **scaphoid bone** is the most likely to be dislocated in this scenario due to its unique position and role in the wrist. It is the most radial of the proximal carpal row and plays a crucial role in wrist motion, making it vulnerable to injury when the wrist is subjected to force, such as during a fall on an outstretched hand.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because, although the lunate can dislocate, it is less commonly associated with the mechanism described.
**Option B:** This option is incorrect as the capitate, while it can be involved in complex wrist injuries, is not the most commonly dislocated bone in a simple fall on an outstretched hand.
**Option D:** This choice is incorrect because the triquetrum, although part of the proximal carpal row like the scaphoid, is not as commonly dislocated in this specific scenario.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **scaphoid fractures** are common in young adults after a fall on an outstretched hand, and they have a high risk of **avascular necrosis** due to the bone's blood supply entering distally.

**Correct Answer:** C. Scaphoid bone