5. How did Germany serve as the front line of Cold War?

Due to the division of Germany between West Germany (with a democratic political system, supported by the USA), and East Germany (with a communist political system, supported by the Soviet Union.)

Explanation:

After World War II Germany was under the control of four allied countries; United States, France, England, and The Soviet Union. Later the United States, France, and England were united to form West Germany, and the Soviet Union continued with the control of East Germany.

However, due to the breach of the agreements by the Soviet Union, and the establishment of a communist regime in different countries, the tension between the United States and the Soviet Union increased until it led to the Cold War.

This left Germany at the center of the tension, having its territory divided between a faction supported by the United States and a faction supported by the USRR, divided only by a wall, known as "the Berlin Wall."

I hope this information can help you.

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i believe your answer is d)