What are the key grape varieties used in the red wines of Carinena and Calatayud?

The key grape varieties used in the red wines of Carinena and Calatayud are Garnacha and Tempranillo, which makes this the correct choice. Garnacha, also known as Grenache in France, is particularly significant in these regions due to its ability to thrive in warm climates and produce wines with rich fruit flavors, spice, and good acidity. It contributes to the body and character of the wines, often producing a variety of styles, from light and fruity to more structured and aged versions.

Tempranillo is another important variety that is prevalent across many regions in Spain, and it adds depth and complexity to the blends. Known for its dark fruit flavors and potential for aging, Tempranillo complements Garnacha's characteristics, making the resulting wines well-rounded and appealing to a wide range of palates.

The interplay of these two varieties allows for the creation of wines that are not only expressive of their terroir but also maintain a balance of fruitiness and acidity, which is characteristic of the red wines from Carinena and Calatayud.