A is the correct answer.
One of the worries about a Federal government, especially after a Revolution against a King, was that the Executive would become a new King.
Most amendments pertain to individual liberties. The First Amendment, for example, identifies the right of the individual to freedom of speech and religion.
It was added to protect the people from the national government (reducing the amount of the governments power). Adding the Bill of Rights to the U.S Constitution helped change people's mind to ratify the constitution.
