The purpose of sending troops to Vietnam was to prevent Vietnam from becoming a communist state- much like the neighbouring China did. The US feared the domino effect in which more and more neighbouring states become communist.
This policy was called the containment policy (the answer is B) - communism were to be contained.
She kicked it at a wall, causing the ball to hit the wall and bunce back to her.
I don't even know to be honest I had the same question that I couldn't figure it out until my friend did it
A. Can offer significant relief