By standardizing the length of cart axles, Shi Huangdi was able to standardize the shape of

A. wheels

B. roads

C. currency

D. bags of rice

The correct option is B roads

Qin Shi Huang of own name Zheng, was the king of the Chinese state of Qin of the 247 a. C. until 221 a. C. and later the first emperor of a unified China of 221 a. C. to 210 a. C., reigning under the name of First Emperor.

Having unified China, he and his Prime Minister Li Si introduced a series of important reforms aimed at strengthening the recent unification, and carried out Herculean construction projects, more specifically the precursor version of the current Great Wall of China with a balance of 2 million dead. Despite all the tyranny of his autocratic rule, Qin Shi Huang is still considered today as a kind of colossal founder in Chinese history, as a superman whose unification of China has lasted more than two millennia (with interruptions).