Rossi: It is undemocratic for people to live under a government in which their interests are not represented.
Rossi's argument structure
Rossi states a general principle () and applies it to children: since children's interests are sometimes different from their parents', children should have the right to vote.
Smith's response (background)
Smith concedes Rossi's point about different interests but raises a separate practical objection: children's conceptions and time horizons are too immature for voting responsibility.
Evaluate
The question asks how Rossi's argument is structured. Rossi opens with a general principle (about democracy and representation) and then applies it to a specific case (children). That's an appeal to a general principle.
Goal
Find the answer that describes Rossi as appealing to a general principle.