Among types of carrier ownership, ______ are privately or publicly owned companies committed to performing a movement service of the same quality for all shippers on an equal basis and without discrimination.

Among types of carrier ownership, ______ are privately or publicly owned companies committed to performing a movement service of the same quality for all shippers on an equal basis and without discrimination.

A.common carriers

B.contract carriers

C.private carriers

D.united carriers

正确答案是A