One way Qin Shihuangdi united China was by

A.

making his subjects write in the same way.

B.

asking his enemies to live with him.

C.

forcing everyone to change their names.

D.

enslaving people to build things for him.

A. Making his subjects write in the same way.

Explanation:

Qin Shiguandi promoted the use of a common language, written and spoken, as the most powerful motor of the Chinese unification in the mid-3rd Century B.D, along with the unification of weights and measures, the establishment of a centralized administration and construction of roads throughout territories. Hence, the right answer is A.

what are the others?

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.