Which of these diets excludes all animal products?

The correct choice is the diet that excludes all animal products, which is the vegan diet. This diet strictly avoids not just meat but all animal-derived products, including dairy, eggs, and any other animal-related ingredients such as gelatin or honey. By eliminating all forms of animal products, a vegan diet is primarily plant-based, focusing on fruits, vegetables, grains, legumes, nuts, and seeds.

In contrast, the pescatarian diet includes fish and seafood, allowing for certain animal products. The vegetarian diet typically excludes meat but may include dairy products and eggs. The flexitarian diet is a more flexible approach to eating, allowing for occasional meat and fish consumption while primarily emphasizing plant-based foods. This distinction highlights why the vegan diet is the only option that wholly excludes animal products.