An experienced healthcare professional instructs a new colleague on caring for a patient with dyspnea due to a pulmonary fungal infection. Which action by the new colleague indicates a need for further teaching?

A Listening to the patient's lung sounds several times during the shift B Placing the patient in droplet precautions and in a private hospital room D Monitoring the patient's serology results to identify the specific infecting organism C Increasing the oxygen flow rate to maintain oxygen saturation above 90%