A nurse in an urgent care clinic is collecting data from a client who reports having diarrhea for the past 3 days. Which of the following findings indicates hypokalemia?

The correct answer is C: Muscle weakness. Hypokalemia is a condition characterized by low potassium levels in the blood. Potassium plays a crucial role in muscle function, and low levels can lead to muscle weakness. This is because potassium is essential for proper muscle contraction. Pitting edema (choice A) is more indicative of fluid retention, not hypokalemia. Diplopia (choice B) refers to double vision and is not directly related to hypokalemia. Hyperactive bowel sounds (choice D) are associated with increased bowel motility, which is not specific to hypokalemia. Therefore, muscle weakness (choice C) is the most appropriate finding indicating hypokalemia in this scenario.