How could a country prevent a more efficient firm in another country from selling its televisions at a price below that of their country's firms?

The correct answer for the question that is being presented above is this one: "A country can prevent a more efficient firm in another country from selling its televisions at a price below that of their country's firms by the interaction between competing producers, who attempt to make the highest possible profit, and consumers, who try to pay as little as possible ultimately determines price.