Why best describes the significance of the great wall in the history of china?
a. it showed what chinese feudal warlords could achieve by working together
b. it prevented any raiders or invaders from ever entering into china
c. it kept the civilized world of china separated from nomads north of the wall
d. it provided jobs for hundreds of thousands of workers for years

The answer is; B.

This great wall of China built along the northern borders of China to act as a barrier to invasion by Eurasian nomadic groups. The wall was constructed in 220–206 BC by the first emperor of China and modified and reinforced by later dynasties. It extends to approximately 21,000km in length.

it would be  

germany had to pay all damages related to the war.

and i think

germany had to take sole responsibility for the war.