You are answering a USMLE-style medical question. Question: A 22-year-old gravida 1 presents to her physician at 15 weeks gestation for a prenatal appointment. She complains of a rash involving her chest, face, and arms, a watery nasal discharge, and mild bilateral knee pain. She has had these symptoms for about 5 days. The symptoms do not seem to bother her too much, but she is concerned for the baby. She had contact with her younger sister, who also had a rash and was diagnosed with rubella infection about 10 days ago at a family gathering. She cannot confirm her vaccination history. Her vital signs are as follows: blood pressure, 110/70 mmHg; heart rate, 89/min; respiratory rate, 12/min; and temperature, 37.6℃ (99.7℉). Examination shows a moderately dense maculopapular lacy rash spread over the patient’s trunk, extremities, and face. No lymph node, liver, or spleen enlargement is noted. The knee joints appear normal. Serology performed 1 year ago Current serology Rubella IgM - negative Rubella IgM - negative Rubella IgG - 1:128 Rubella IgG - 1:64 Rubella IgG avidity - high Rubella IgG avidity - high What is the proper next step in the management of this woman? Options: A) Reassure and recommend vaccination against rubella postpartum B) Recommend pregnancy termination C) Arrange a chorionic villus sampling D) Recommend additional serologic testing for parvovirus B19 Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.