You are answering a USMLE-style medical question. Question: A 32-year-old woman presents to the emergency department with abdominal pain and vaginal discharge. She gave birth to a healthy baby boy three days prior to presentation. Since then, she has been feeling sick, and she is concerned that she has been getting worse over time. On presentation, her temperature is 100.7°F (38.1°C), blood pressure is 115/78 mmHg, pulse is 105/min, and respirations are 14/min. Physical exam reveals abdominal discomfort with uterine tenderness, and laboratory results show elevated white blood cell count with many plasma cells. The most likely cause of this patient's disorder has which of the following characteristics? Options: A) Alpha-hemolytic cocci in chains B) Beta-hemolytic cocci in chains C) Coagulase-positive cocci in clusters D) Gamma-hemolytic cocci in chains Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.