What type of seal may not be placed on a package unless the product is produced from non-organic sources?

The correct answer is the REAL seal, which stands for "Responsible, Efforts for Animal Welfare." This seal is specifically designed to indicate that a product meets certain standards of humane treatment for farm animals, but it does not imply any organic certification.

Only products created from organic sources are permitted to use the organic seal, which indicates that they have met specific USDA organic standards. The presence of the REAL seal can signify responsible farming practices; however, it does not restrict its use strictly to organic products. Thus, it may be placed on products that are derived from non-organic sources because its criteria are based on animal welfare rather than the organic nature of the product.

In contrast, both the USDA Certified seal and the Organic seal are exclusive to products that meet organic farming standards, while the Quality Assurance seal is typically associated with food safety and quality but is not limited to organic or non-organic classifications. This distinction clarifies why the REAL seal can be placed on non-organic products, while the other seals are not applicable in the same context.