Respuesta :
The best option from the list would be that "b. The United States began to build up its military and to stockpile weapons," since this was part of the inevitable "Arms Race" that took place between the US and the USSR.
The answers are..
The United States began to build up its military and to stockpile weapons.
The United States persecuted U.S. citizens.
I took the test, and these answers are correct..