Which of the following is one of the key wine regions in the Veneto?

The choice of Amarone della Valpolicella DOCG identifies one of the key wine regions in Veneto. This region is renowned for producing rich, full-bodied red wines made from partially dried Corvina, Rondinella, and Molinara grapes. The unique production method involves drying the grapes to concentrate their flavors, which results in the wine's distinctive character and depth. Amarone is considered one of Italy's flagship wines, showcasing the special winemaking traditions and terroir of the Valpolicella area, thereby making it pivotal within the broader Veneto wine region.

The other options represent significant Italian wine regions but are not located in Veneto. Bolgheri DOC is situated in Tuscany, recognized for its high-quality Bordeaux-style blends. Brunello di Montalcino DOCG, also from Tuscany, is celebrated for its Sangiovese wines. Vernaccia di San Gimignano DOCG, yet another Tuscan designation, is known for its white wines produced from the Vernaccia grape. While all these regions produce exceptional wines, they do not relate to the key wine regions within the Veneto.