Base your answer on which heading best completes the partial outline below? a. nullification crisis b. kansas-nebraska act c. dred scott v. sanford d. election of lincoln (1860)

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.

i think its either b or c

explanation: