General aviation airport operation instructions are certified by _______ ; en-route and line airport operation instructions are certified by _______ and put on the records of CAAC, and international airport operation instructions are certified by _______
A.regional administration of CAAC, CAAC, CAAC
B.regional administration of CAAC, regional administration of CAAC, CAAC
C.CAAC, CAAC, regional administration of CAAC
D.CAAC, regional administration of CAAC, regional administration of CAAC
正确答案是B