Eliza is giving a speech in which she argues that recreational use of marijuana should be legalized because it will reduce crime, save money, and reduce the number of people in prison. what type of persuasive speech is she giving?

I believe the answer is: Question of policy

Question of policy is a form of persuasive technique that being done by challenging the status quo that exist in society at this exact moment.
With this technique, rather than making audience think about 'what should be done' , the speaker is aiming to make the audience think about 'what could be done'