(a decision made by ) votes of all qualified citizens?
A referendum is a direct vote of all voters on important public issues such as constitutional amendments, i.e. unanimous decisions on political issues. For example, "the administration will hold a referendum to approve constitutional amendments." So option C is correct. Of the remaining options, veto means the constitutional right to reject a legislative decision or proposal, suffrage means the right to vote, and voting means the right to participate in public elections. . These options are incorrect because they do not represent the intended meaning.
