**Core Concept**
The question is testing knowledge of **thoracic anatomy**, specifically the types of joints formed by the ribs and their attachments. The **costochondral joints** and **interchondral joints** are key concepts here.

**Why the Correct Answer is Right**
Since the 8th, 9th, and 10th ribs are considered **false ribs**, they do not directly articulate with the sternum. Instead, the 8th, 9th, and 10th ribs are attached to the 7th rib via **cartilaginous joints**, which allow for limited movement.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it refers to a different type of joint.
**Option B:** This is also incorrect as it does not accurately describe the joint in question.
**Option D:** This option is not relevant to the specific joint between the 8th and 9th rib and the 7th rib.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember the classification of ribs and their respective joints for understanding **thoracic anatomy** and **clinical correlations**.

**Correct Answer:** C. syndesmosis