Answer:
Chairman Mao Zedong launched the campaign to reconstruct the country from an agrarian economy into a communist society through the formation of people's communes. Mao decreed increased efforts to multiply grain yields and bring industry to the countryside.
One reason is it helped promote exploration.
Another is communication was faster.
And people learned more about exploration.
spiritual songs were sung in the fields to keep their spirits up
Impeding - to delay or prevent by obstructing it/them.
so your answer is B. Obstructing; slowing down.
C. Sumer I was able to review and it was not Mesopotamia
