What are prompts used for in behavioral training?

Prompts are tools used in behavioral training to elicit or guide a desired response from an individual when a particular condition is present. In this context, the correct choice highlights that prompts are specifically designed to evoke a correct response in the presence of an establishing operation (EO) or a discriminative stimulus (Sd).

Establishing operations are environmental events that increase the effectiveness of a reinforcer, while a discriminative stimulus signals that a particular response will be reinforced. By using prompts, instructors can help learners connect their responses with these cues, facilitating learning and ensuring they engage in the suitable behavior when those conditions are met.

The other options, while related to behavioral training, do not accurately capture the primary function of prompts. Increasing the duration of a response, reinforcing behaviors post-performance, or assessing a learner's skill level are separate processes within behavior analysis and do not reflect the role of prompts, which is specifically to assist in making the correct response more likely in a given situation.