The correct answer is option 1 - Initiative. Initiative is a method used to ascertain public opinion on important legislation. In this method, citizens can propose new legislation or changes to existing legislation through a petition. If the petition garners enough signatures, the proposed legislation will be placed on the ballot for a public vote. This allows the public to express their opinion on the proposed legislation and influence the law-making process. Option 2 - Recall is the process of removing an elected official from office before their term is completed and option 3 - Referendum is a direct vote by the public on a specific issue or policy. Therefore, option 1 is the most appropriate method for ascertaining public opinion on important legislation.