Answer:
B
Explanation:
The arms race was a de facto competition between the USSR and the USA to see which country was better developed, which country had more / better nuclear weapons as a result of tensions from after WWII.
Both governments invested in scientific research into how to create better nuclear weapons: bombs that were more powerful than the other, as a way to try and win the nuclear arms race, or at least get ahead.
I think this is what the question is asking :)
