If the ruling party denies opposition rallies but holds its own rallies, what weakens?

Correct answer: Equal campaign opportunity

Direct answer: Option C, equal campaign opportunity. Fair competition requires all serious candidates and parties to receive a reasonable chance to communicate with voters under the same rules. Here the ruling party can hold rallies but prevents the opposition from doing so. Step by step: one side gets public contact and publicity; the other loses that opportunity; voters receive an unbalanced flow of information; competition becomes unequal. Option C is correct. Option A is wrong because the length of the voter list is not the issue. Option B is wrong because the question does not describe how votes are secretly cast. Option D is wrong because voter identity is unrelated to permission for rallies. A government may regulate rallies for genuine safety reasons, but it must apply neutral rules, not suppress only opponents. Memory cue: equal contest needs equal campaign access.