Answer:
Option (A)
Explanation:
The main significant characteristic of the early humans adapting to their environment was the innovation and use of stone tools. Stone tools are the tools that are made up of very hard and resistant stones.
The early humans were capable enough of making these stone tools, which were mainly used for the cutting and crushing of food items, and also to cut the meat of animals. They also used it for the hunting purpose.
The stone tools are about 2.5 million years old and also provides good evidences supporting the evolutionary pattern of humans.
Thus, the correct answer is option (A).
