What two areas lie west of the Rhône and extend to the Spanish border?

The correct answer highlights the regions of Languedoc and Roussillon, which are located to the west of the Rhône River and extend down to the border with Spain. This geographical position is significant because these regions are integrated into the broader winemaking landscape of southern France, characterized by a diverse climate and variety of grape varieties grown.

Languedoc is known for its large production of wine, ranging from robust reds to fresh whites and sparkling wines, while Roussillon, notably located next to the Spanish border, has a reputation for fortified wines and is home to a range of indigenous grape varieties. The proximity to the Mediterranean Sea also influences the viticulture in these areas, contributing to the warm, sunny growing conditions that allow for diverse styles of wine production.

This geographical relationship underscores the unique characteristics of wines from these regions, emphasizing their distinction from other areas mentioned in the other options.