Correct answer: A. It is not only about number of votes but also equal effect of vote
Explanation: The direct answer is A: the principle is not only about the number of votes but also about equal effect. A common misunderstanding is to read “one person, one vote” and forget “one value.” The complete reasoning is: each eligible person gets one ballot, every ballot is counted under the same rule, and no ballot is made stronger because of wealth, office, group identity, or influence. Option A correctly explains this full meaning. Option B is wrong because the principle gives one vote, not two, to each eligible citizen. Option C is wrong because it is a universal democratic right of eligible citizens, not a privilege for the rich. Option D is wrong because the principle supports elections rather than ending them. It also does not mean that all citizens must think alike; it means their political participation has equal formal weight. Memory cue: never stop at “one vote”; always add “one value.”