## Core Concept
The centre of rotation for bodily movement of a tooth refers to the point around which the tooth moves as a whole unit, without any tilting or angulation, in response to orthodontic forces. This concept is crucial in orthodontics to achieve desired tooth movements. The centre of rotation is an imaginary point that varies depending on the type of tooth movement.

## Why the Correct Answer is Right
The centre of rotation for bodily movement of a tooth is located at the centre of the root or at the apex of the root. This is because, during bodily movement, the tooth translates (moves) as a single unit without rotating or tilting. The apical region of the root provides a stable reference point for such movement. For bodily movement to occur, forces must be applied in a manner that the line of action passes through this centre of rotation.

## Why Each Wrong Option is Incorrect
- **Option A:** This option might represent a location that is not anatomically or biomechanically relevant for the centre of rotation during bodily tooth movement.
- **Option B:** Similarly, this could represent an incorrect location; for instance, the centre of the crown, which might be more relevant for tipping movements.
- **Option C:** This might not accurately represent the centre of rotation for bodily movement; it could be related to another type of tooth movement or an irrelevant anatomical location.

## Clinical Pearl / High-Yield Fact
A key clinical pearl in orthodontics is that the centre of rotation varies with the type of tooth movement: it is at the apex for bodily movement, at the centre of the crown for simple tipping, and between the apex and the centre of the crown for controlled tipping or root movement. Understanding these concepts helps in planning and executing precise orthodontic tooth movements.

## Correct Answer: C. Apex of the root.