Which of the following is not a primary grape variety in Bordeaux?

Tempranillo is not a primary grape variety in Bordeaux, making it the correct choice in this question. In Bordeaux, the main grape varieties used in the production of red wine include Cabernet Sauvignon, Merlot, and Cabernet Franc. These three grapes play significant roles in the blends typical of the region's famed wines, known for their structure, depth, and aging potential.

Tempranillo, on the other hand, is primarily associated with Spain, particularly in regions like Rioja and Ribera del Duero, where it is celebrated for producing full-bodied red wines with distinct flavors and characteristics unique to its terroir. This geographical distinction firmly categorizes Tempranillo as outside the primary grape varieties of Bordeaux, providing a clear contrast to the options that do belong to that prestigious French wine region.