Which of the following wines is fundamentally characterized by their region of origin?

Muscadet from Nantais is fundamentally characterized by its region of origin due to the unique terroir and specific winemaking practices associated with the Nantais region in the Loire Valley. Muscadet is primarily made from the Melon de Bourgogne grape, which thrives in this area, benefiting from its maritime climate, which imparts distinctive qualities to the wine. The influence of the Atlantic Ocean, along with the region's soil composition, particularly its schist and gneiss, contributes to the fresh, crisp, and mineral-driven profile typical of Muscadet wines. This close connection between the wine's characteristics and its geographical origin highlights the importance of terroir in defining Muscadet.

The other choices, while they may have ties to their regions, do not exemplify this concept as strongly. Riesling from Alsace exhibits regional traits, but it is also popular in other parts of the world, so its characteristics can be influenced by non-regional factors. Cabernet Sauvignon from Bordeaux is very much identified with its region due to historical significance and specific blends, but Cabernet Sauvignon is widely grown in numerous regions, leading to diverse styles. Chardonnay from California showcases regional identity, yet it too is a grape variety that adapts well to different climates and win