Which of the following defines Tennessee whiskey?

Tennessee whiskey is specifically defined by the requirement that it must contain a minimum of 51% corn in its mash bill and undergoes a unique charcoal filtering process known as the Lincoln County Process. This process involves passing the whiskey through charcoal before aging, which contributes to its distinctive smoothness and flavor profile.

The designation of being a Tennessee whiskey not only emphasizes the importance of the grain composition but also highlights the region's traditional approach to production. The charcoal filtering is integral to the identity of Tennessee whiskey, differentiating it from other types of whiskey, such as bourbon.

Understanding these specific characteristics helps to appreciate the unique qualities and regulations that define Tennessee whiskey, making option C the correct choice.