Which of the following terms refers to congeners that contribute waxy flavor and character?

The term that refers to congeners contributing waxy flavor and character is ethyl palmitate. Ethyl palmitate is an ester formed from the reaction of ethanol and palmitic acid, a fatty acid. This compound is known for imparting a creamy, waxy mouthfeel and rich character to spirits, particularly in certain types of aging processes or when derived from specific raw materials.

In the context of spirits production, the presence of congeners like ethyl palmitate can significantly influence the sensory experience of the final product. This unique contribution of flavor profile is not typically associated with the other options, which may have different characteristics and are not recognized for their waxy sensations.