The answer you're looking for is c.
The answer is Kennedy
Kennedy approved the backing of the South Vietnamese in their Civil War.
<span>The correct answer is checks and balances. They wanted to make a system where one part of the government would be in charge of keeping another part in line, while itself being kept in line by the third part. It is like a triangle where you control and are being controlled. This was done to prevent anyone becoming too powerful and tyrannical.</span>