Answer:
military and defense advancement
Explanation:
The Cold War began after the Second World War when tension between Eastern and Western Europe rises. The anxiety began because of different political ideas as Eastern Europe followed communism and the Western as Democracy. The Cold War created a sense of tension and fear. The arms race started within two nations, which led to the Cold War. Both countries, the Soviet and the United States, spent billions of capital trying to make nuclear weapons to display their strength.
I think it's A. Hope this helps!
