Which verbal operant is evoked by a motivational state and typically followed by reinforcement?

The correct choice is the mand. A mand is a type of verbal operant that is directly influenced by an individual's motivational state, meaning it arises from a specific need or desire. When a person expresses a mand, such as requesting help or an item they want, it is typically followed by immediate reinforcement from the listener, such as receiving the requested item or action. This relationship between the motivational state and the resulting verbal behavior is a fundamental aspect of mands, making them distinct from other types of verbal operants like tacts, intraverbals, and echoics, which do not arise directly from a motivational state or need. Understanding this distinction is critical in the study of behavior analysis and its application in educational settings.