A school-aged child with acute glomerulonephritis (AGN) has a blood-pressure 136/90 mm Hg, oliguria, and periorbital edema. Which intervention is the nurse's priority?

Encourage oral fluids to maintain hydration

Elevate the head of the bed to ease breathing due to pulmonary edema

Restrict sodium intake as ordered

Monitor daily weight at the same time each day to assess for fluid retention