The correct option is D Amnesty
An amnesty is a decision by a government that allows political prisoners to go free. For example, " Most political prisoners were freed under the terms of the amnesty." Hence, Option D is correct. Among the rest of the options, parole means the temporary or permanent release of a prisoner before the expiry of a sentence, on the promise of good behaviour, forgiveness means the action or process of forgiving or being forgiven, clemency means mercy; lenience. These options do not express the intended meaning, hence incorrect.