Which statement shows that the north was becoming "war weary"?

a. it appeared that no progress was being made in the war effort.

b. more and more citizens were insisting on a total defeat of the south.

c. there were a tremendous number of casualties suffered in may and june.

d. the war was lasting a long time with no visible end in sight.

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.