Concept:Universal suffrage is the term used when all adult citizens have the right to vote in elections.
Explanation:The word "suffrage" simply means the right to vote in a political election.
When this right is extended to every adult citizen without restriction on wealth, gender, race, or social class, it is called universal suffrage.
Adult suffrage is narrower because it focuses only on adults and does not strongly express the inclusive right of all citizens.
Electoral suffrage and nationality suffrage are less appropriate or nonstandard ways of describing the general voting right.
Therefore, in this question, the right of citizens to vote is best captured by universal suffrage.
Answer:A. Universal suffrage