Which organization focuses on setting national agriculture standards?

The USDA, or the United States Department of Agriculture, is the correct answer because it is the primary federal agency responsible for establishing national standards related to agriculture. It plays a crucial role in developing policies and regulations that govern various aspects of farming, food safety, nutrition, and rural development. This encompasses everything from setting guidelines for organic farming to regulating the safety of food products.

Moreover, the USDA also conducts research and provides education on agricultural practices, which aids in the establishment of these standards. By doing so, it ensures consistency and quality across agricultural products and practices in the United States, thereby serving both producers and consumers.

To provide some context, organizations like the National Farmers Union and the American Farm Bureau Federation are more focused on advocacy and representing the interests of farmers rather than establishing official standards. Meanwhile, the National Agricultural Statistics Service is a branch of the USDA that collects and analyzes agricultural data, which supports the USDA's efforts but does not directly set standards itself.