The preamble of the constitution demonstrates
that the writers believed that sovereignty belongs
to the
(1) federal government (3) president
(2) state governments (4) people

I think that the best answer is "people" - the forth choice.

The Preamble starts with the words "We the People" and does not mention the Government, either state or federal, nor the president: the other choices are incorrect.

The answer to this question is a