## Core Concept
The question tests the knowledge of vertebral anatomy, specifically the distinguishing features between cervical and thoracic vertebrae. Vertebrae in the spine have unique characteristics that allow them to support specific functions and movements in different regions of the spine. The cervical spine, located in the neck, and the thoracic spine, located in the upper back, have distinct anatomical features.

## Why the Correct Answer is Right
The correct answer highlights the key difference between typical cervical and thoracic vertebrae. A typical cervical vertebra has a **foramen transversarium**, which is a transverse foramen in each transverse process through which the vertebral artery and vein pass. This feature is characteristic of cervical vertebrae and is not found in thoracic vertebrae. Thoracic vertebrae, on the other hand, have **costal facets** on their transverse processes and vertebral bodies for articulation with the ribs, a feature not seen in cervical vertebrae.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because while it's true that cervical vertebrae have a more horizontal orientation of their facet joints compared to the more sagittal orientation in thoracic vertebrae, this is not the most distinctive feature mentioned.
- **Option B:** This option is incorrect as it does not accurately represent a primary distinguishing feature between cervical and thoracic vertebrae.
- **Option D:** This option is incorrect because the presence of a **spinous process** is not unique to either cervical or thoracic vertebrae; both have spinous processes, but they differ in shape and orientation.

## Clinical Pearl / High-Yield Fact
A key clinical point to remember is that the **vertebral artery** passes through the **foramen transversarium** of cervical vertebrae (C6 to C1), which is crucial for understanding the vascular supply to the brain and the potential for vertebral artery injuries in cervical spine trauma.

## Correct Answer: C.