隋代产生了（  ），成为以后历代王朝选拔官吏的主要方式。
（  ）was produced in Sui Dynasty, which became the main mode of selecting officials in the following dynasties.
A、九品中正制 Nine-rank system
B、太学 Imperial college
C、科举制度 Imperial examination system
D、察举制度 System of examination and recommendation