What is called the "Three age System?
A. Classification of Prehistoric age based on hunting practices by early humans
B. Classification of Prehistoric age based on agricultural practices by early humans
C. Classification of Prehistoric age based on tools used by early humans
D. Classification of Prehistoric age based on eating habits of early humans

Hint: The Three Age System has widely contemplated archaeology's first paradigm. An assembly created in the early 19th century that announced prehistory could be divided into three parts, based on technical improvements in weapons and tools

Complete step-by-step solution:
The Three Age system was generally introduced in 1837, according to Christian Jürgensen Thomson. His opinions evolved out of his role as spontaneous curator of the Royal Commission for the Preservation of Antiquities' messy collection of runic stones and other artifacts from ruins and ancient tombs in Denmark.
A system for categorizing prehistoric artifacts according to consecutive stages of technological advancement, allocated into the three ages Stone, Bronze, and Iron ages. The 19th-century Danish archaeologist Christian Thomsen proposed a creative category system based on the belief of a historical succession in human technology from stone to bronze to iron. Once practical study of archaeological exhibitions commenced, Thomsen's Three Age system was revised into four ages by the subdivision of the Stone Age into the Old Stone and New Stone Ages. Successive improvement has added Mesolithic and Chalcolithic to the original terms, which are now known as intervals instead of ages. In the Middle East, and Egypt, and the use of full terminology is not uniformly accepted among archaeologists today
Hence the three-age system is defined as the Classification of Prehistoric age based on tools used by early humans.

Thus, option (C) is correct.

Note: The sector into various periods was, in reality, a fluid procedure because the adoption of various materials and technologies would have been incremental. A community using stone tools might have encountered traders giving bronze tools, taking them straight into the Bronze Age with no transitional Copper Age.