Question: A 16-year-old female presents for evaluation of nausea. She first noticed nausea a few days ago and has been unable to eat breakfast in the mornings before school. She denies sore throat, headache, vomiting, abdominal pain, and diarrhea. She is unsure of the date of her last menstrual period. On exam, she is well appearing with normal vital signs. You palpate a soft mass the size of an orange in the center of her lower abdomen. Which of the following test will most likely reveal the cause of this mass? A. An abdominal X-ray B. A urine pregnancy test C. A rapid strep test D. A CT scan of the abdomen