A trade-diverting customs union:

A、increasestradeamongunionmembersandwithnonmembernations
B、reducestradeamongunionmembersandwithnonmembernations
C、increasestradeamongmembersbutreducestradewithnon-members
D、reducestradeamongunionmembersbutincreasesitwithnonmembers