During the yuan dynasty, the mongols suspended the chinese civil service examination system. what important effect did this have?

a. it led to a large peasant uprising that spread quickly across all of china and resulted in hundreds of deaths.
b. it increased the level of mongol control over the chinese by preventing the entrance of more chinese into the civil service.
c. it provoked the alliance between chinese peasants and russian serfs that eventually expelled the mongols from both china and russia.
d. it prompted many chinese civil servants to move to india, where they became an important part of india's civil administration.