A community health nurse is providing teaching to a group of clients who have alcohol use disorder. Which of the following findings should the nurse include in the teaching as a manifestation of alcohol withdrawal?

The correct answer is D: Insomnia. Alcohol withdrawal commonly presents with symptoms such as difficulty sleeping, restlessness, and anxiety due to the disruption of the central nervous system. Insomnia is a hallmark manifestation of alcohol withdrawal syndrome. Bradycardia (A) is not typically associated with alcohol withdrawal; instead, tachycardia is more common. Hypothermia (B) is rare in alcohol withdrawal, as alcohol tends to cause vasodilation and can lead to increased body temperature. Increased appetite (C) is not a typical symptom of alcohol withdrawal; in fact, decreased appetite or nausea is more common. Therefore, the correct choice is D based on the typical manifestations of alcohol withdrawal.