Answer:
D. They created a standard system of writing that has influenced modern Chinese.
Step-by-step explanation:
The Qin dynasty existed in ancient china. The dynasty which was said to have lasted for just 15 years between 221 BC to 206 BC, accomplished various things like a legacy. Among which is the "creation of a standard system of writing that has influenced modern Chinese."
This is evident in the formulation of the Chinese small seal script which is used and later spread out throughout the Chinese territory.