You are answering a USMLE-style medical question. Question: A 45-year-old woman presents to the physician for a follow-up visit. She has no specific complaints at this visit however, she has noticed that she is more tired than usual these days. At first, she ignored it and attributed it to stress but she feels weaker each week. She is sometimes out of breath while walking for long distances or when she is involved in strenuous physical activity. She was diagnosed with rheumatoid arthritis 3 years ago and has since been on medication to assist with her pain and to slow down disease progression. Her temperature is 37.0°C (98.6°F), the respiratory rate is 15/min, the pulse is 107/min, and the blood pressure is 102/98 mm Hg. On examination, you notice thinning hair and mildly cool extremities with flattened nail beds. A complete blood count and iron studies are ordered. Which of the following is most likely to show up on her iron profile? Options: A) Increased iron-binding capacity B) Low ferritin levels C) Decreased iron-binding capacity D) Normal iron-binding capacity Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.