Answer:
Option: standardized system of weights and measures
built the Great Wall
Step-by-step explanation:
Qin Shi Huangdi founded the Qin Dynasty. He became the first emperor to unite China by bringing all feudal states together. He building the great wall that could protect the empire from outside invaders, especially the Mongols. Qin state centralized by forming a stiff system of laws that were suitable throughout the country. Under those changes, Qin slowly began to the standardization of weights, measures, and currency.