What is the predominant red grape of Austria, also considered native to the country?

The predominant red grape of Austria, which is also considered native to the country, is Zweigelt. This grape variety was created in the 1920s by crossing two other Austrian varieties: St. Laurent and Blaufränkisch. It has since become synonymous with Austrian red wine production and accounts for a significant portion of the red wine made in the country.

Zweigelt is known for its ability to produce well-rounded, fruity wines with a moderate level of tannins, and it flourishes in Austria's unique climate and soil conditions, which are ideal for producing vibrant red wines. In contrast, the other options listed are grape varieties that, while enjoyed in Austria, are not indigenous to the country and are more commonly associated with other wine-producing regions around the world. Cabernet Sauvignon, Merlot, and Syrah are all internationally recognized varieties that originate from places like France and California, rather than Austria. This context highlights why Zweigelt is correctly identified as the predominant and native red grape variety of Austria.