Which appellation was created in the province of Mendoza in 1993?

The correct answer, which is Lujan de Cuyo, refers to an established appellation in Mendoza, Argentina, created in 1993. This region is particularly famous for Malbec and has gained international recognition for producing high-quality wines. The designation Lujan de Cuyo was one of the first regions in Argentina to receive Denomination of Origin status, which emphasizes the importance of terroir in winemaking and aligns with global standards for wine regions.

The other choices represent different geographical or wine-producing regions in Argentina, but they were established either before 1993 or do not hold the specific significance attached to Lujan de Cuyo's appellation status. Valle de Uco, for instance, is notable for its high-altitude vineyards and quality wines but was formally recognized later than 1993. Patagonia is known for its emerging wine regions that gained attention more recently, while Pampa Alta is not widely recognized as a formal appellation in the same context. The recognition of Lujan de Cuyo has significantly influenced the growth and quality of Argentine wines, which is why it is paramount to understand its role in the country's viticultural landscape.