The first emperor of China solved the problem of invaders. Thus, the correct option is D). Invaders.
What did the first emperor of China do?
Qin Shi Huangdi, was the first Qin Emperor of China. He was a cruel and a brutal ruler who unified the ancient China and laid the foundation for the Great Wall.
The main problem that was solved by Qin Shi Huangdi was that he created a complex system of administration and centralized bureaucracy, that greatly improved the overall economy and organization of the region.
The major achievements of the Qin Shi Huangdi is that, he unified the China, by creating the first dynasty that ruled by the first emperor Qin Shi Huang. Other achievement is the creation of the Great Wall and a large army of Terracotta Warriors.
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