The correct answer is option D. The Zollverein was formed to promote trade among the German states.
The initial custom union agreements were hypothesized in 1828, which therefore led to the formation of Zollverein on January 1st, 1834 as a customs union of several states.
The Zollverein's primary impact was the elimination of trade restrictions between member states and the adoption of a single external tariff for non-members.
A Zollverein, or customs union, was established in 1834 at Prussia's request. The majority of the German States joined. The objective of Zollverein was to economically unite all of Germany. Through the blending of personal and regional concerns, it assisted in reawakening and raising national sentiment among the German people.
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