History 2 Question! 10 points!?

It's 3. The race for better military technology during the 40s-60s was all part of the arms race due to the Cold War between the US and the Soviet Union. After the Soviet Union detonated their first bomb in 1947, the US was terrified that the Soviets would usurp their military power, so they began searching for ways to develop more powerful weapons. Out of that search came the hydrogen bomb.