下列关于组类II飞机的描述哪一项正确？ Which of the following statements about the group II aircraft is correct?
A.以活塞式发动机为动力的飞机 The piston engine powered aircraft
B.以涡轮螺旋桨发动机为动力的飞机 The turboprop engine powered aircraft
C.以涡轮喷气发动机为动力的飞机 The turbojet engine powered aircraft
正确答案是3