If only one party is allowed to campaign in an election which condition is violated?

Correct answer: Equal opportunity and fair competition

Direct answer: A is correct. Democratic elections require genuine competition in which political parties and candidates can present their views under reasonably equal rules. If only one party is allowed to campaign, voters hear one side while other parties cannot explain their policies or seek support. This gives the permitted party an unfair advantage and prevents voters from comparing alternatives freely. Option A is correct because equal opportunity and fair competition are essential conditions of a democratic election. Option B is wrong because the age requirement for voters is not the issue described here. Option C is wrong because the distance of polling booths concerns access to voting, not equal campaigning rights. Option D is wrong because the physical size of a ballot paper does not decide whether parties received a fair chance to campaign. The key distinction is that a party may win lawfully, but it must not silence competitors before voters make their choice. Memory cue: democracy needs a level playing field, not a race in which only one runner is allowed to speak.