Correct answer choice is :
A) A complex system of writing
Step-by-step explanation:
Ancient Chinese have discovered a set of stuff that we still use today. The things that Antique Chinese discovered that we use today are paper, silk, the wheelbarrow, rubber, and many more. The most significant invent that the Chinese made was explosive they used explosive in the wars just like we do today. We don’t use explosive as much as Antique Chinese did. Another one of China's discovery was fireworks. They were basically used to put on concerts but later they used them to frighten off opponents. Those were the various common items that Ancient Chinese discovered.