The correct answer is option 2 - The United States. The United States is the largest exporter of small arms in the world. Small arms refer to firearms that can be carried and used by an individual. This includes handguns, rifles, and shotguns, among others. The United States has a significant arms industry and exports a substantial number of small arms to various countries around the world. These exports contribute to the United States` position as the largest exporter in this category.

Option 1 - Russia, is known for its arms industry and exports a significant number of firearms, but it is not the largest exporter of small arms in the world.

Option 3 - China, is also known for its arms industry and exports a considerable quantity of small arms, but it is not the largest exporter in the world.

Option 4 - France, has a notable arms industry, but it does not export as many small arms as the United States.

In summary, while all the options are major arms exporters, the United States holds the distinction of being the largest exporter of small arms globally.