question: Q:A 28-year-old man comes to the physician because of a 1-week history of weakness in the fingers of his right hand. One week ago, he experienced sudden pain in his right forearm during weight training. He has no history of serious illness. Physical examination shows impaired flexion of the proximal interphalangeal joints, while flexion of the distal interphalangeal joints is intact. Which of the following muscles is most likely injured?? 
  {'A': 'Palmaris longus', 'B': 'Flexor carpi radialis', 'C': 'Flexor carpi ulnaris', 'D': 'Flexor digitorum superficialis', 'E': 'Flexor digitorum profundus'},