The kids were not enthralled with Morty the Magician’s act.

To be “enthralled” means to be completely fascinated or captivated by something. If the kids were not enthralled by Morty’s act, they were not interested or fascinated, so “bored” is the best choice. “Diverted” means entertained or distracted, which is closer to being enthralled.

AI-written and checked against the verified answer.