Final answer:
The greatest concern for the nurse when assessing a 68-year-old woman with pneumonia would be capillary refill greater than 3 seconds and buccal cyanosis, as these suggest significant oxygenation issues.
Step-by-step explanation:
Which Data Would Be of Greatest Concern to the Nurse:
When completing the nursing assessment of a 68-year-old woman hospitalized due to pneumonia, the data that would be of greatest concern is option C: Capillary refill greater than 3 seconds and buccal cyanosis. This indicates potential hypoxemia and poor peripheral perfusion which could signify serious oxygenation issues needing immediate treatment. Choice A indicates mental orientation and is not of immediate concern unless alterations are present.
Choice B clear breath sounds, would be unusual for a pneumonia case and therefore not the greatest concern. Choice D a hemoglobin level of 13 g/dl, is within normal limits and would not be of immediate concern.