An Older Adult Patient Has an Intravenous Infusion of 0

An older adult patient has an intravenous infusion of 0.45% normal saline infusing at 150 mL/hr. The nurse is most concerned by which of the following assessment findings?

A) Tenderness at the IV site
B) Urine specific gravity is 1.018
C) Capillary refill is < 3 seconds
D) Newly noted crackles in the lungs