The correct option is D Plebiscite
A plebiscite is the direct vote of all the members of an electorate on an important public question such as a change in the constitution, that is, a decision which is taken unanimously on a political question. For example, "the administration will hold a plebiscite for the approval of constitutional reforms". Hence, Option C is correct. Among the rest of the options, veto means constitutional right to reject a decision or proposal made by a lawmaking body, suffrage means right to vote, franchise means the right to vote in public elections. These options do not express the intended meaning, hence incorrect.