Final answer:
The data provided focuses on attitudes toward trade and globalization rather than the specific number of retailers in each country, but based on economic size, the United States would be expected to have the largest number of retailers.
Step-by-step explanation:
The country with the largest number of retailers is not explicitly mentioned in the data provided, as the question seems to be focused on attitudes towards globalization and trade, rather than on the concrete number of retailers. However, based on economic size and population, the United States would typically be expected to have the largest number of retailers compared to Argentina, China, Brazil, and Japan. The data does suggest that the United States has less need to trade internationally due to its large economy, whereas countries like China have shown a very favorable attitude towards increasing globalization. Despite this, the information does not directly answer the question regarding the number of retailers.