## Core Concept
A combination clasp is a type of clasp used in removable partial dentures (RPDs) to provide retention, stability, and support. It is designed to engage both the undercut areas around natural teeth and the surface of the tooth for additional support.

## Why the Correct Answer is Right
The correct answer, , indicates that a combination clasp consists of a **rest** and a **reciprocal arm** and a **retentive terminal**. The rest provides support to the denture by sitting on the occlusal or incisal surface of a tooth, the reciprocal arm provides stability by engaging the tooth on the opposite side of the clasp, and the retentive terminal engages an undercut area around the tooth to provide retention.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option is incorrect because it does not accurately describe the components of a combination clasp. A rest and a retentive terminal are part of a clasp, but the reciprocal arm is essential for stability.
* **Option B:** - This option is incorrect because it lacks the reciprocal arm, which is crucial for providing stability to the denture.
* **Option D:** - This option is incorrect as it does not include the rest, which is vital for providing support to the denture.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the design of a clasp, including a combination clasp, must be carefully considered to ensure proper distribution of forces to the abutment teeth and to prevent excessive stress that could lead to tooth mobility or loss.

## Correct Answer: C.