Correct answer: A. Equality of vote effect is weak
Explanation: The direct answer is A: equality of vote effect is weak. Adult franchise means that all eligible adults have the right to vote, but the democratic idea of equal value also requires that their votes have comparable influence. The reasoning is: adults are allowed to vote; however, some regions are deliberately made less influential; citizens in those regions may formally possess the right but their votes do not affect representation equally; therefore the equality of political influence is weakened. Option A is correct because it focuses on the actual effect of a vote, not merely on having permission to cast one. Option B, voter list unnecessary, is wrong because accurate voter lists remain important for identifying eligible voters. Option C, secret ballot ended, is wrong because lower regional influence does not by itself reveal how individuals voted. Option D, campaign is fair, is unrelated and cannot be concluded from the facts. The lesson is that equal citizenship needs both equal access to voting and fair impact after votes are cast. Memory cue: a right that exists only on paper but has deliberately reduced effect is not full political equality.