**Core Concept**
Synovial joints are a type of joint that allows for a wide range of motion, characterized by a space between the articulating bones that is filled with synovial fluid. This fluid reduces friction and enables smooth movement between the bones.

**Why the Correct Answer is Right**
Synovial joints are classified based on the shape and type of movement they allow. The correct answer is likely related to the type of movement or the structure of the joint. Synovial joints can be classified into six types: ball-and-socket, hinge, pivot, condyloid, saddle, and plane joints. Each type allows for specific movements, such as flexion, extension, rotation, or circumduction.

**Why Each Wrong Option is Incorrect**
**Option A:** This option may be incorrect because it does not accurately describe a characteristic of synovial joints. Without more information, it's difficult to determine why this option is wrong.
**Option B:** This option may be incorrect because it contradicts the definition of synovial joints. Synovial joints are characterized by a space between the articulating bones, which is filled with synovial fluid.
**Option C:** This option may be incorrect because it does not accurately describe a type of movement allowed by synovial joints. While synovial joints do allow for rotation, this option may be too vague or incorrect.

**Clinical Pearl / High-Yield Fact**
Synovial joints are prone to degenerative changes, such as osteoarthritis, which can lead to pain and stiffness in the affected joint. Understanding the structure and function of synovial joints is crucial for diagnosing and managing joint-related disorders.

**Correct Answer:** C.