## Core Concept
The **Stack formula** is a method used in forensic odontology for estimating the **age of an individual** based on the characteristics of their teeth. This method involves assessing specific dental features to make an estimation.

## Why the Correct Answer is Right
The Stack formula is particularly relevant for estimating age in **subadults** or individuals whose age is not readily determinable through other means. This method assesses dental development, which is a reliable indicator of age up to a certain point in life. Dental development includes the formation and eruption of teeth, which follows a relatively predictable timeline.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because it does not accurately represent the Stack formula's application.
* **Option B:** This option is incorrect as it does not specifically relate to the Stack formula for age estimation from teeth.
* **Option D:** This option is incorrect because it does not accurately describe the use of the Stack formula.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **dental age estimation** methods like the Stack formula are crucial in **forensic investigations** and **legal proceedings** where an individual's age is unknown or disputed. These methods help in identifying human remains and in cases involving unaccompanied minors.

## Correct Answer Line
**Correct Answer: C.**