What must happen for historians to consider a particular time in a civilization a classical period? the civilization must make extraordinary achievements in areas such as art and science

rulers must govern according to religious or philosophical teachings
a written language must develop and be used by the population

someone must unite the entire area of the civilization into an empire

A. The civilization must make extraordinary achievements in areas such as art and science.

Explanation: Hope this works! :) If not, I am sorry. :( If it does, Your Welcome! :)

after world war ii, the united states and the soviet union were the major economic, military, and political powers. the world was bilateral multipolar bipolar unilateral

after world war ii, the united states and the soviet union were the major economic, military, and political powers. the world was bipolar.  

the great leap forward, mao zedong's plan to increase china's agricultural and industrial production, was an overwhelming success. true false

the great leap forward, mao zedong's plan to increase china's agricultural and industrial production, was an overwhelming success. true.

explanation: