Which of the following does not contain gluten?

Wild rice is the correct choice as it does not contain gluten. Wild rice is actually a semi-aquatic grass and is not related to the typical grains that contain gluten, such as wheat, barley, and rye. Gluten is a protein found specifically in the grains mentioned in the other options.

Barley, rye, and durum wheat all contain gluten, which contributes to the elasticity of dough and is what makes these grains problematic for individuals with celiac disease or gluten intolerance. Thus, recognizing wild rice as a gluten-free alternative is essential for culinary applications and for catering to dietary restrictions.