You are answering a USMLE-style medical question. Question: A 45-year-old man comes to the physician because of mild left-sided abdominal pain when lifting heavy objects that has developed over the past 6 months. He has had a weight loss of 41 kgs (90 lbs) in the past year. Physical examination shows a soft bulge inferior and lateral to the navel on the left. A CT scan of the abdomen of a patient with the same condition is shown. Which of the following muscles is located directly medial to the pathology seen on the CT scan? Options: A) Psoas major B) External oblique C) Rectus abdominis D) Transverse abdominal " Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.