Which are steps taken by the first emperor of a united China to unify the country? Select all correct answers.

Question 1 options:

standardized system of weights and measures

built the Great Wall

forbade the practice of ancestor worship

appointed Confucius as his chief adviser

Option: standardized system of weights and measures

built the Great Wall

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.      

what are the options?