Immediate conflicts:
... The USA had atomic weapons and the USSR did not. (The US would not share that technology with the Soviets.)
... The USSR did not assure that free and fair elections took place in Eastern Europe -- it saw to it that Soviet-aligned governments were installed there.
... Tensions over the East Germany / West Germany and East Berlin / West Berlin division of territory.
Deeper causes:
The USA was committed to capitalism and democratic institutions of government.
The USSR was committed to communism and imposed authoritarian government.
The Cold War was mostly a tension between these worldviews.
Answer: https://www.cforks.org/Downloads/us_role_rebuilding_japan.pptx
The clause was intended to prevent the country from ever becoming an aggressive military power again. However, the United States was soon pressuring Japan to rebuild its army as a bulwark against communism in Asia after the Chinese Civil War and the Korean War.
The creation of the German Confederation in 1815 was largely in
reaction to the growing sense of German nationalism, which had not
existed in Europe prior to the 19th century. While strains of
nationalism certainly existed before the turn of the century, it was
France's conquest of the German lands in the first decade of the 19th
century that first fully aroused German nationalists into proposing a
unified, German state. Indeed, J.G. Fichte's Addresses to the German Nation, given in Berlin in 1808, called on Germans to unite under their common language and traditions.
Perhaps
no other statesman was in such a fine position to make this dream a
reality as the Chancellor of Prussia during the mid-19th century, Otto von Bismarck.
Bismarck was a fervent German nationalist who wanted a German nation,
but specifically one dominated by his Prussia. As a result, once
appointed, Chancellor Bismarck set out to strengthen and improve the
Prussian army and gain international allies that would help Prussia on
its way to unifying Germany.
I could be wrong but I think it would be A and D I could be wrong but give it a shot.