A 23-year-old man who is an infielder on a baseball team has a two-day history of pain in his non-dominant right hand that began after he swung the bat and missed a pitch. He is no longer able to swing the bat without pain. Examination shows point tenderness on the ulnar side of the palm. There is no obvious swelling or ecchymoses, and findings on neurovascular examination are normal. A CT scan through the affected area is shown. Which of the following is the most likely diagnosis?
A. Fracture of the trapezium
B. Fracture of the hook of the hamate
C. Fracture of the pisiform
D. Fracture of the triquetrum
E. Tear of the triangular fibrocartilage complex