Answer: B - Oxygen Administration is the first treatment for a client with dyspnea due to pneumonia. The client with dyspnea is at risk of becoming hypoxic. Bed rest, increased fluid intake, and antibiotic administration are provided to clients with pneumonia and dyspnea, but they are not the FNP's first action. These actions do not resolve the immediate need of the client. Antibiotic administration is a consideration that can follow the immediate needs of ensuring the patient's oxygen levels do not become a risk.