Which process is used to produce high-concentration beverage alcohol?

The process that produces high-concentration beverage alcohol is distillation. Distillation involves heating a fermented liquid to the point where the alcohol evaporates, then capturing and condensing that vapor back into liquid form. This method allows for the separation of alcohol from the water and other components present in the fermented mixture, resulting in a beverage with a significantly higher concentration of alcohol.

In contrast, fermentation is the initial process that converts sugars into alcohol and carbon dioxide through the action of yeast, but it does not produce high concentrations of alcohol. Filtration is typically used to remove impurities but does not increase alcohol concentration. Evaporation refers to the process of a liquid turning into vapor, which is not a controlled method for achieving high alcohol content in beverages. Therefore, distillation is the correct choice as it is the technique specifically designed to create high-alcohol spirits.