The Patient with a Suspected Subdural Hematoma Is on an Intravenous

The patient with a suspected subdural hematoma is on an intravenous (IV) drip of mannitol infusing at 50 mL/hr.The nurse explains that the slow infusion rate is essential for what purpose?

A) To ensure effectiveness of the drug.
B) To avoid fluid overload.
C) To maintain electrolyte balance.
D) To maintain adequate blood pressure (BP) .