What are the three key wine regions of Catalunya?

The three key wine regions of Catalunya are indeed Catalunya DO, Penedès DO, and Priorat DOC. This is correct because Catalunya is an autonomous community in northeastern Spain known for its diverse wine production. The Catalunya DO serves as an overarching designation that encompasses all the wine produced in the region, while Penedès is particularly renowned for its innovative approach to wine-making, especially Cava, a sparkling wine. Priorat DOC is recognized for its high-quality red wines made from Garnacha and Cariñena grapes grown in a rugged, slate-rich terroir, establishing it as one of the most prestigious wine regions in Spain.

The other options incorrectly include regions that are not part of Catalunya. Ribera del Duero and Rioja are significant Spanish wine regions, but they are located outside of Catalunya, primarily in the regions of Castile and León and La Rioja, respectively. Rías Baixas, known for its Albariño wines, is in Galicia, which is also far removed from Catalunya. Therefore, the choice that lists Catalunya DO, Penedès DO, and Priorat DOC accurately reflects the key wine regions within the autonomous community of Catalunya.