A client with pneumonia has a urine output of 60 mL over the last four hours, and laboratory results reveal a serum creatinine increase from 1.5 mg/dL to 2.3 mg/dL. Which treatment should the nurse identify as a contributing factor to this development?
a. A 2-gram sodium cardiac diet
b. Chest physiotherapy twice daily and as needed
c. Gentamicin 100 mg intravenous every 8 hours
d. Albuterol 0.083% solution 2.5 mg inhaled four times daily