小型单发私人飞机运行需要通过哪一部法规审定？ Which regulatory approval should be get

小型单发私人飞机运行需要通过哪一部法规审定？ Which regulatory approval should be get for the small single-engine private aircraft operation?

A.91部 The 91 part

B.135部 The 135 part

C.121部 The 121 part

正确答案是A