What distinguishes a tact from an intraverbal?

The correct answer emphasizes that a tact involves labeling a present item. Tacting is a type of verbal operant in which an individual names or labels something they can see, hear, or otherwise directly experience in their environment. This function is primarily about communicating information about the present stimuli, which helps in establishing connections between language and the environment.

In contrast, an intraverbal does not require the presence of a specific item or stimulus to function; instead, it is often related to responses that occur in conversation or dialogue where one person's verbal behavior generates another's response. The distinction lies in the fact that intraverbals are about recalling and responding to language independently of immediate physical stimuli, whereas tacts are explicitly about describing or identifying external items or events.

Therefore, recognizing that a tact serves the purpose of labeling items directly relates to understanding how verbal behavior operates in the context of the available stimuli and the environment, which is what makes this answer the most accurate.