Final answer:
The arms race contributed to tensions between the United States and the Soviet Union as the countries competed to stockpile weapons to demonstrate their destructive power in war
Step-by-step explanation:
The sentence that most clearly describes how the arms race contributed to tensions between the United States and the Soviet Union during the Cold War is option A: The countries competed to stockpile vast stores of weapons in order to prove how severely they could harm each other in war.
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