Trade diversion arises in a customs union if it:

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