You should choose whichever issue is most prominent, then research to find the topic with the most reliable information. from there, you can build your base on that solid information. it has to be facts or a legitimatized opinion, otherwise you can't easily defend your position on said topic. make sure your opinion is well founded. you should also be interested in the topic, otherwise your attention will slip.
To help you search more efficiently for information !
I would chose D) They seldom come nearer to it than planting-time, harvest-time, cherry-time, spring-time, or fall-time.
-Hiadamcom/Agarvated
I say talk about economic policy. Argue for a position you believe in (be it Socialism, Laissez-Faire Capitalism, or whatever). I would start by using a anecdote that described the issue using the negative consequences of embracing the other perspective, immediately tarnishing the person's first impression of the opposite ideology. Then, I would involve logos by saying things like "just think about it, and you'll realize it makes perfect sense" and explaining my position as though it were a formula. Ethos would come into the picture when I mention the opinions of professionals and scholars who I've hand=picked to agree with me on the topic. Pathos has already been used in the form of the beginning anecdote, a "sob story" so to speak.
Hope that I helped!