Which of the following is a type of dark ale available?

The selection of 80 Chain Oatmeal Stout as a type of dark ale is appropriate because oatmeal stouts are classified within the broader category of dark ales. These beers are known for their rich, dark color, often resulting from the use of roasted barley or other dark malts, which impart flavors of chocolate, coffee, and caramel. Oatmeal stouts, in particular, incorporate oats into the recipe, providing a smooth and creamy mouthfeel that enhances the overall drinking experience.

On the other hand, the other options, such as Vigilante IPA, Sunshine Lager, and Enigma Pilsner, represent different styles of beer that are primarily lighter in color and taste profile. IPAs and lagers are typically brewed with pale malts, producing a lighter hue compared to dark ales. Thus, 80 Chain Oatmeal Stout distinctly stands out as a dark ale.