What was the most important subject that Confucius thought people should study? Why?

Confucius thought that the important differences in human beings are determined by environment and education, by the habits and preferences they develop and the lives they lead.

Explanation:

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.

you so !