Which verbal operant allows the speaker to identify features of their environment through labeling?

The tact is the verbal operant that specifically involves the speaker labeling or identifying features of their environment. This process allows individuals to describe objects, actions, or events around them based on their sensory experiences. For example, when someone sees a dog and verbalizes, "dog," they are using a tact to express their observation.

This form of verbal behavior is crucial as it not only helps in communication but also plays a vital role in learning and social interaction. By using tacts, individuals can categorize and relate to their environment more effectively, which is essential for developing language skills and enhancing interaction with others.

The other verbal operants do not involve the same function. For instance, the echoic requires the speaker to repeat what they have heard, the mand is used to request or demand something, and the intraverbal involves responding to questions or statements with related verbal behavior. Thus, the tact specifically focuses on labeling observable aspects of the environment, making it the correct choice in this context.