You are answering a USMLE-style medical question. Question: A 46-year-old woman comes to the physician because of a 3-day history of diarrhea, moderate abdominal pain, and weakness. Her symptoms began on the return flight from a 2-week yoga retreat in India, where she stayed at a resort. She was mildly nauseous as she boarded the flight, and diarrhea followed immediately after eating the in-flight meal. Since then, she has had up to five watery stools daily. She has a 1-year history of gastroesophageal reflux disease and is allergic to shellfish. Her only medication is ranitidine. She appears lethargic. Her temperature is 37°C (98.6°F), pulse is 70/min, and blood pressure is 115/72 mm Hg. Abdominal examination shows diffuse tenderness with no guarding or rebound. Bowel sounds are hyperactive. Which of the following is the most likely pathogen? Options: A) Giardia intestinalis B) Shigella species C) Staphylococcus aureus D) Enterotoxigenic Escherichia coli Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.