Answer: Establishing post offices
Explanation: The "Elastic Clause" of the Constitution grants Congress power to pass unspecified laws "necessary and proper" for the exercise of its expressed powers, and since this is an unspecified law it is OK.
The answer is C (the 3rd one)
During the Vietnam War, the United States supported the South Government.
In spite of the U.S. economic and military aid, South Vietnamese government and the Army of the Republic of Vietnam did not demonstrate that they were capable of handling the Viet Cong (National Liberation Front).
