What area in southern France lies east of the Rhône and extends to the Italian border?

Provence is the correct answer because it is the region located in southern France that extends east of the Rhône River and reaches the Italian border. This area is known for its diverse landscapes, which include beautiful coastlines, vineyards, and hills. It is famous for its rosé wines and a variety of other wine styles, primarily made from grape varieties such as Grenache, Syrah, and Mourvèdre, which thrive in the Mediterranean climate.

The other regions mentioned do not fit the geographic description provided in the question. Languedoc is situated to the west of the Rhône and encompasses a larger area, primarily producing a wide range of red wines. Roussillon, while located near the eastern part of southern France, is further south and known for its fortified wines, and it does not extend to the Italian border directly. Tavel, on the other hand, is a small appellation within the southern Rhône Valley known specifically for its rosé wines and does not encompass the broader area described in the question.