What are the main red grape varieties of Rioja DOCa?

In Rioja DOCa, the primary red grape varieties include Tempranillo, Garnacha (Grenache), Mazuelo (Carignan), and Graciano. Tempranillo is often recognized as the flagship variety of the region, celebrated for producing wines that exhibit a wide range of flavors and aging potential. Garnacha adds fruitiness and body to blends, while Mazuelo contributes acidity and structure. Graciano, although used in smaller quantities, is valued for its deep color and aromatic qualities, enhancing the overall complexity of Rioja wines.

Understanding the significance and characteristics of these grape varieties is key to appreciating the unique profile of Rioja wines, which often present a beautiful balance of fruit, structure, and aging potential. Other options introduce grape varieties that may be associated with other wine regions or are not foundational to the Rioja DOCa red wine profile, which further highlights the correctness of the main varieties listed in the correct answer.