The healthcare provider prescribes a 5% dextrose injection with 20 units of regular insulin for a client with a serum potassium level of 6.0 mEq/L (6.0 mmol/L) and glucose level of 180 mg/dL (10.0 mmol/L). Which evaluation is most important for the nurse to include in this client's plan of care?

Choice A reason: Obtaining a 12-lead electrocardiogram is important but not as frequent as monitoring potassium levels in this situation.Choice B reason: Evaluating glucose levels is important but secondary to monitoring potassium levels.Choice C reason: Monitoring and documenting intake and output are important but not as critical as frequent potassium level assessment.Choice D reason: Frequent assessment of serum potassium levels is crucial due to the high initial potassium level and the use of insulin, which affects potassium levels.