Which grape varieties typically make up a wine from Pomerol?

A wine from Pomerol primarily comprises Merlot and Cabernet Franc, making this the correct choice. Pomerol is one of the most renowned wine regions in Bordeaux, France, and it is particularly known for its rich, merlot-dominant red wines. Merlot thrives in Pomerol's clay and gravel soils, contributing to the wines' plush fruit character and softness.

Cabernet Franc is also an essential component of Pomerol blends, although it is used in smaller proportions compared to Merlot. This grape adds complexity and aromatic qualities, along with herbal and floral notes that enhance the overall profile of the wine.

The other grape varieties listed in the options do not align with the classic composition of Pomerol wines. Cabernet Sauvignon, while significant in other Bordeaux regions, is not the primary grape in Pomerol. Chardonnay and Pinot Noir are primarily associated with white Burgundy and Champagne, and Sangiovese is most closely associated with Tuscany in Italy. Therefore, the essential elements that make up Pomerol wines are captured well by highlighting Merlot and Cabernet Franc.