## Core Concept
The sternum, or breastbone, is a long, flat bone in the center of the chest. It connects to the ribs via costal cartilages and, indirectly, to the scapula (shoulder blade) through a complex of bones and ligaments. The primary connection between the sternum and the scapula involves the clavicle (collarbone), which acts as a strut between the sternum and the scapula.

## Why the Correct Answer is Right
The correct answer, **C. Clavicle**, is right because the clavicle serves as the only direct bony connection between the axial skeleton (to which the sternum belongs) and the appendicular skeleton (to which the scapula belongs). The sternoclavicular joint, where the clavicle meets the sternum, and the acromioclavicular joint, where the clavicle meets the scapula, facilitate this indirect connection between the sternum and the scapula.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because there is no direct or commonly recognized indirect attachment between the sternum and the scapula via a structure simply labeled "A" without further specification.
- **Option B:** Similarly, this option lacks specificity and does not accurately describe a known anatomical structure that connects the sternum to the scapula.
- **Option D:** This option is also incorrect for the same reasons as options A and B; it does not accurately represent a known connection between the sternum and scapula.

## Clinical Pearl / High-Yield Fact
A key clinical point to remember is that fractures of the clavicle can disrupt the connection between the sternum and the scapula, potentially affecting shoulder mobility. The sternoclavicular joint is one of the few joints that connects the axial and appendicular skeletons.

## Correct Answer: C. Clavicle