You are answering a USMLE-style medical question. Question: A 24-year-old Asian woman is admitted to the hospital at 30 weeks gestation with nausea, vomiting, and right upper quadrant pain. She is gravida 2 para 0 with a history of the same complaints in her last pregnancy which ended with a stillbirth at the 31st week. Her older sister had preeclampsia in both of her pregnancies. Currently, the patient is responsive but lethargic. The vital signs are as follows: blood pressure 150/90 mm Hg, heart rate 85/min, respiratory rate 15/min, and temperature 36.4°C (97.5°F). The physical examination shows jaundice, right upper quadrant tenderness, and 2+ pitting edema of the lower extremities. The patient’s laboratory findings are as follows: Erythrocyte count 2.7 million/mm3 Hemoglobin 10.1 g/dL Hematocrit 0.56 Reticulocyte count 1.1% Leukocyte count 8,300/mm3 Thrombocyte count 190,000/mm3 Total bilirubin 5.3 mg/dL (91 µmol/L) Conjugated bilirubin 4.2 mg/dL (72 µmol/L) Alanine Transaminase (ALT) 101 U/L Aspartate Transaminase (AST) 99 U/L Creatinine 0.9 mg/dL (80 µmol/L) Which of the following factors is a risk factor for this patient’s condition? Options: A) The patient’s age B) Nulliparity C) History in the previous pregnancy D) History of preeclampsia in a sibling Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.