Concept:
The Three Age System is one of the most important classification systems in archaeology and prehistory. It divided human prehistoric cultural development into three technological ages based on the primary material used for tools and weapons.
These ages are:
\[
\text{Stone Age}
\]
\[
\text{Bronze Age}
\]
\[
\text{Iron Age}
\]
The concept revolutionized archaeological interpretation because it provided a systematic chronological framework for studying prehistoric cultures.
Step 1: Understanding the Three Age System.
Before the development of the Three Age System, archaeological objects were not scientifically classified chronologically.
Christian Jurgensen Thomsen proposed that prehistoric human societies evolved technologically through three successive stages:
• Stone Age,
• Bronze Age,
• Iron Age.
This system helped archaeologists:
• Organize museum collections,
• Establish chronological sequences,
• Understand technological progress.
Step 2: Identifying the scholar associated with the theory.
The Three Age System was introduced by:
\[
\boxed{\text{Christian Jurgensen Thomsen}}
\]
He was a Danish archaeologist and museum curator.
His classification became the foundation of modern prehistoric archaeology.
Therefore:
\[
\text{Option (D) is correct.}
\]
Step 3: Analyzing the remaining options carefully.
Option (A):
\[
\text{John Marshall}
\]
John Marshall was associated with:
• Archaeological Survey of India,
• Excavations at Harappa and Mohenjo-daro.
He did not introduce the Three Age System.
Hence, incorrect.
Option (B):
\[
\text{Robert Bruce Foote}
\]
Robert Bruce Foote is known as:
\[
\text{Father of Indian Prehistory}
\]
He discovered Paleolithic tools in India but was not associated with the Three Age System.
Hence, incorrect.
Option (C):
\[
\text{Mortimer Wheeler}
\]
Mortimer Wheeler was a famous archaeologist known for excavation methods and Indus Valley excavations.
He did not formulate the Three Age System.
Thus, incorrect.
Step 4: Final conclusion.
Since Christian Jurgensen Thomsen introduced the Three Age System, the correct answer becomes:
\[
\boxed{\text{(D) Christian Jurgensen Thomsen}}
\]