Question

5. Zollverein was a
a. Diplomatic institution
b. Custom union
c. Administrative union
d. Trade union

Answer 1

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${\large{\red{\boxed{\bold{b.\:Custom\:Union}}}}}$

Zollverein was the custom union union who had abolished all tariff barriers and reduced the currency from 30 to only 2.

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Answer 2

custom union is a correct answer