If a law is applied retrospectively to punish an old act, which rights value is affected?

Correct answer: Predictable law and fair process

The direct answer is A: predictable law and fair process are affected. People should be able to know beforehand which conduct is prohibited and what punishment may follow. Reasoning: an act happens at an earlier time; later, the government creates or changes a law; it applies that later rule to the old act; the person is punished for something that was not punishable under the known rule at the time; this harms legal certainty and fairness. Option A is correct. Option B, secrecy of voting, concerns keeping a ballot choice private and is unrelated. Option C, an election poster, is campaign material, not a rights value involved here. Option D, party registration, concerns recognition of political parties and does not explain retrospective punishment. Fair legal systems generally avoid retrospective criminal punishment because citizens need predictable rules and a fair chance to guide their conduct. The exact legality can depend on constitutional rules and the type of law, but the stated rights principle is clear. Memory cue: punishment should normally follow a known rule, not a rule invented after the act.