Phalanx was the battle formation that produced the most powerful fighting force in the ancient world
Answer:
A locomotive is a powered railway vehicle used for pulling trains. It was revolutionary because it made trains faster and let them carry heavier things
A and B is out because these undoubtedly are unique Chinese achievements. So is D. The Chinese are infamous for these things. Other achievements include gunpowder, fireworks, ect.
C is basically the answer because the chinese aren't the only race or country to do so. Many people have done it in the past before them and present in the terms of civilization. It isn't simply uniquely or originally from them.
Trueeee I think I read this Wikipedia and it said that so yeah
