## Core Concept
The placement of retentive clasp arms in removable partial dentures (RPDs) is crucial for ensuring proper retention, stability, and distribution of forces. The design and placement of these clasp arms are based on the principles of biomechanics and the anatomy of the dental arch.

## Why the Correct Answer is Right
The correct placement of retentive clasp arms on each abutment tooth involves positioning them such that the forces exerted are within the tolerance of the abutment teeth and the surrounding tissues. This usually means engaging the clasp arms on the mesial or distal surfaces of the abutment teeth where possible, to distribute forces effectively. The specific placement often depends on the Kennedy classification of the edentulous space and the overall design of the RPD.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not specify a universally accepted principle for the placement of retentive clasp arms on abutment teeth. Without proper distribution of forces, it could lead to undue stress on certain teeth.
- **Option B:** This option is incorrect as it similarly lacks specificity regarding the optimal placement for retentive clasp arms. Incorrect placement could compromise the retention and stability of the RPD.
- **Option D:** This option is incorrect because it also fails to adhere to established principles for clasp arm placement. Proper placement is critical for preventing complications such as tooth mobility, pain, and RPD dislodgement.

## Clinical Pearl / High-Yield Fact
A key point to remember is that retentive clasp arms should ideally be placed on the abutment teeth in a manner that allows for even distribution of forces and prevents excessive movement or tilting of the RPD. The **rest** (support) and **clasp** (retention) components of the RPD work together to achieve this goal.

## Correct Answer: C.