Which of the following is a commercial example of a Flanders Red?

Duchesse de Bourgogne is indeed a commercial example of a Flanders Red ale, which is a style known for its rich, malty character combined with a slight tartness, often derived from the mixed fermentation process that involves both yeast and lactic acid bacteria. This beer typically showcases flavors of dark fruit, caramel, and wine-like qualities, which are characteristic of the style.

In contrast, other options differ significantly in style and flavor profile. Snickers Ale, while it may incorporate sweet and nutty flavors, does not adhere to the characteristics of a Flanders Red. Guinness Stout is a classic Irish dry stout, marked by roasted malt flavors and a creamy mouthfeel, which is far removed from the fruity and vinegary notes associated with Flanders Reds. Blue Moon Belgian White is a witbier, characterized by its light, citrusy, and spice-driven characteristics, which also does not align with the profiles found in Flanders Reds. Thus, Duchesse de Bourgogne stands out as a true representative of this unique Belgian beer style.