You are answering a USMLE-style medical question. Question: A 63-year-old woman with end-stage renal disease complains of feeling lightheaded after her hemodialysis sessions for the past month. She worries she might eventually lose her balance and fall. She has had diabetes mellitus for 22 years. Her medications include folic acid, vitamin B12, amlodipine, and erythropoietin. At the clinic, her blood pressure is 135/80 mm Hg when lying down before dialysis and 110/55 mm Hg when seated after hemodialysis. Cardiopulmonary examination shows no abnormal findings. Laboratory studies after hemodialysis show a Hb of 10.5 mg/dL, a blood sugar of 189 mg/dL, and a hemoglobin A1C of 7.1%. To reduce the likelihood of falls, the most appropriate management is which of the following? Options: A) Cooling the dialysate B) Eating heavier meals during dialysis C) Increasing ultrafiltration D) Steroid administration Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.