Yao Ming, who ______ the Houston Rockets, is working hard to make his dream come true.

A．joined

B．joined in

C．took part in

D．competed in

客运经营者在旅客运输途中擅自变更运输车辆或者将旅客移交他人运输的，由（）责令改正，处1000元以上3000元以下的罚款；情节严重的，由原许可机关吊销《道路运输经营许可证》。