Which regions comprise the five main areas of Champagne?

The five main areas of Champagne are accurately identified in the correct option, which includes the Montagne de Reims, Vallée de la Marne, Côte des Blancs, Côte de Sézanne, and Côte des Bar. Each of these regions contributes distinct characteristics to the Champagne produced there.

The Montagne de Reims is known for its Pinot Noir grapes, which provide body and complexity to Champagne. The Vallée de la Marne is recognized for both Pinot Meunier and Chardonnay grapes, offering a fruitier style. The Côte des Blancs is particularly celebrated for Chardonnay, producing some of the finest and most celebrated Blanc de Blancs. The Côte de Sézanne, though less prestigious, contributes quality Chardonnay, while the Côte des Bar, located further east, is known for producing both Pinot Noir and Pinot Meunier, reinforcing the diversity of grape varieties in this sparkling wine region.

The other choices mix regions from different areas of France or include regions that do not belong to Champagne, which is why they do not accurately represent the core regions of this renowned wine-producing area.