A successful example of such a customs union that ended tariffs and trade restrictions among its members is the European Union (EU).
This refers to the group that have agreed to charge the same import duties to allow free trade between themselves.
Hence, an example of customs union that ended tariffs and trade restrictions among its members is the European Union (EU).
Therefore, the Option D is correct.
Read more about customs union
brainly.com/question/3895853
#SPJ1