which of the following statements best explains why the addition of a bill of rights was necessary to ensure ratification of the constitution? a. the anti-federalists were fearful of a too powerful national government; b. the federalists were distrustful of a national bill of rights being used by states; 3. the anti-federalists were distrustful of state govenments; or 4. the federalists were fearful of a too powerful natioanl government.

The statement "a. the anti-federalists were fearful of a too powerful national government" best explains why the addition of a Bill of Rights was necessary to ensure ratification of the Constitution. Anti-Federalists were concerned about the potential abuse of power by the federal government and wanted to ensure that individual liberties and rights were protected.