The correct answer is option 'B' - Clavicle.

Explanation:
The axial skeleton consists of bones that form the central axis of the body, including the skull, vertebral column, and thoracic cage. On the other hand, the appendicular skeleton includes the bones of the limbs and the pectoral and pelvic girdles.

The clavicle, commonly known as the collarbone, is a long bone that connects the axial skeleton to the appendicular skeleton. It is located on the anterior side of the thorax, connecting the sternum (part of the axial skeleton) to the scapula (part of the appendicular skeleton).

Here is a detailed explanation of the role of the clavicle in linking the axial and appendicular skeleton:

1. Function of the clavicle:
- The clavicle acts as a strut, providing support and stability to the shoulder complex.
- It helps to maintain the position of the upper limb, allowing for a wide range of movements.
- It also protects important structures, such as blood vessels and nerves, that pass beneath it.

2. Articulations:
- The clavicle articulates with the sternum at the sternoclavicular joint, forming the medial end of the bone.
- At the lateral end, it articulates with the acromion of the scapula, forming the acromioclavicular joint.

3. Attachment points:
- The clavicle serves as an attachment site for various muscles, ligaments, and tendons.
- Muscles, such as the deltoid and trapezius, attach to the clavicle, allowing for movement and stabilization of the shoulder girdle.
- Ligaments, such as the coracoclavicular ligament, reinforce the stability of the acromioclavicular joint.

4. Role in movement:
- The clavicle acts as a strut, transmitting forces from the upper limb to the axial skeleton and vice versa.
- It allows for a wide range of movements, including flexion, extension, abduction, adduction, and rotation of the shoulder joint.

In summary, the clavicle plays a crucial role in connecting the axial and appendicular skeleton. It provides stability, support, and mobility to the shoulder complex, allowing for various movements of the upper limb.