A 47-year-old Latina woman presents with a 2-month history of persistent abdominal pains. She becomes uncomfortable after eating, especially after consuming fats, eggs, chocolate, fried foods, fatty foods, and rich desserts. Her pains are primarily located in her right upper abdominal quadrant and often radiate to her right shoulder blade. Physical examination is essentially unremarkable. Blood pressure is 122/82 mm Hg, she has a pulse of 72 per minute, and a temperature of 98.6°F with respirations 16 per minute. Her abdominal examination reveals no tenderness, no guard, no rebound, and normally active bowel sounds. Her liver and spleen are not palpable. She has no readily palpable abdominal masses. She is not jaundiced. She has no scleral icterus. What test should be given to confirm the probable diagnosis? A. Oral cholecystogram B. US abdomen C. CT scan abdomen D. MRI abdomen