## Core Concept
The Angle's classification of malocclusion is a widely used system in orthodontics to categorize the relationship between the upper and lower teeth. It was originally proposed by Edward H. Angle in 1899. The system classifies malocclusions into three main classes based on the mesio-distal relationship of the upper and lower first molars.

## Why the Correct Answer is Right
The correct answer, **Proffit**, modified the Angle's system by incorporating more contemporary understanding and additional factors. However, it seems there might be some confusion as the most notable modification or expansion of Angle's classification to include more detailed assessment is often attributed to other researchers as well.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because there is no widely recognized modification by this name associated with Angle's classification in the provided text.
- **Option B:** Similarly, this option does not directly correspond with known major modifications of Angle's system.
- **Option C:** This option is also incorrect for the same reason; no widely recognized modification is attributed here.

## Clinical Pearl / High-Yield Fact
A key point to remember is that Angle's classification, while foundational, has limitations, such as not accounting for vertical or transverse discrepancies. Therefore, other classification systems and assessments are often used in conjunction with Angle's for comprehensive treatment planning.

**Correct Answer: D. Proffit.**