Which flavor pump is appropriate for adding a toffee nut flavor to beverages?

The choice of the flavor pump labeled as "TN" is appropriate for adding a toffee nut flavor to beverages because it directly corresponds to the flavor profile of toffee nut. Flavor pumps are typically designated with specific abbreviations that indicate their flavor, and "TN" is widely recognized in beverage practices as the standard abbreviation for toffee nut. This makes it a reliable and efficient option for baristas when creating drinks that require this specific flavor.

In contrast, the other options do not represent toffee nut. Understanding the unique designations for each flavor pump is crucial for accurately customizing beverage flavors and maintaining consistency in drink preparation.