Which of the following statements about vintage spirits is true?

The statement about vintage spirits that is true is that they are produced exclusively from a single year's harvest. This means that for a spirit to be labeled as "vintage," it must originate from grapes or other raw materials that were harvested in a specific year, capturing the unique characteristics of that year's growing conditions. This concept mirrors practices in the wine industry where a vintage denotes the year of harvest and reflects the quality and characteristics imparted by that specific year.

The other options present limitations or inaccuracies regarding vintage designations. Stating that vintage spirits can only be produced in Armagnac incorrectly suggests that this classification is exclusive to just one type of spirit, when in fact vintage designations can apply to various types of spirits, particularly certain types of brandy, including Cognac and others. The idea that only specific brandies can be labeled as vintage is misleading, as many types of spirits may use the vintage classification depending on whether they originate from a single harvest. Lastly, claiming that every Cognac can be labeled as vintage misrepresents the criteria that must be met for a spirit to earn that label; only those produced from a specific year's harvest can legitimately be called vintage, rather than all Cognacs.