1. The Zolleverein was an attempt to unify Germany; this ambition of German unification could be realised by removing trade barriers and allowing free movement of goods. Hence, Option D is correct.
2. The case given for study is a clear reason to observe that nation states can be a reality due to economic interests. Hence, Option B is correct.
<h3>Who was
Friedrich List?</h3>
A German-American economist, whose full name was Georg Friedrich List, developed the "National System" of political economy. The German Historical School of Economics was established by him.
Friedrich argued for the Customs Union of Germany from a nationalist standpoint. The concept of "Zolleverein" given by Georg Friedrich List. As he was the professor of economics, the case study is given by him only.
Therefore, Option D for 1, and Option B for 2, is correct.
Learn more about "Zolleverein" from here:
brainly.com/question/2033713
#SPJ1