**Core Concept**
Bennett's fracture-dislocation is an injury involving the base of the first metacarpal bone in the hand. It is a type of **intra-articular fracture**, which means it involves the joint surface. This injury is typically caused by a fall onto a partially flexed thumb or a direct blow to the thumb.

**Why the Correct Answer is Right**
The correct answer is associated with the fracture of the **first metacarpal base**. This type of fracture is characterized by a dislocation or subluxation of the carpometacarpal joint, specifically involving the trapezium bone and the first metacarpal. The **abductor pollicis longus** tendon plays a role in this injury, as it can cause displacement of the fracture fragment.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it does not accurately describe the location of the fracture.
**Option B:** This option is also incorrect as it does not involve the first metacarpal bone.
**Option C:** Similarly, this choice is incorrect as it is not related to the first metacarpal base.

**Clinical Pearl / High-Yield Fact**
Bennett's fracture-dislocation is a significant injury that requires prompt treatment to avoid complications such as **arthritis** or **loss of thumb function**. It is essential to recognize this injury early and manage it appropriately to ensure optimal outcomes.

**Correct Answer:** D. first metacarpal base