Political advertising and prisoners dilemma

Your best friend paul tells you that his father wants to cook panamanian ceviche, but he is missing one ingredient. how can you ask what he wants? ? usted prefiere la cebolla? ? usted quiere la cebolla? ? usted tiene la limonada? ? usted quiere la limonada?

Choose the correct answer. the phrase "por cierto" means: by certain for sure over there for now does anyone know the answer to this question?

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