A Young Housewife Was on a Ladder Cleaning a Window $2.5 \mathrm{in}$

A young housewife was on a ladder cleaning a window in her home, when she lost her balance and started to fall. To protect herself, she held out her right hand, which smashed through the glass. On admission to the hospital, she was bleeding profusely from a superficial laceration in front of her right wrist. She had sensory loss over the palmar aspect of the medial one and a half fingers but normal sensation of the back of these fingers over the middle and proximal phalanges. She had difficulty in grasping a piece of paper between her right index and middle fingers. All her long flexor tendons were intact.
-The following statements concerning this patient are correct except which?

A) The ulnar artery was cut in front of the flexor retinaculum, and this accounted for the profuse bleeding.
B) The loss of skin sensation on the palmar aspect of the medial one and a half fingers was caused by the severance of the median nerve as it crossed in front of the flexor retinaculum.
C) The normal sensation on the back of the medial one and a half fingers over the proximal phalanges was caused by the fact that the posterior cutaneous branch of the ulnar nerve arises about $2.5 \mathrm{in}$ . $(6.25 \mathrm{~cm})$ proximal to the flexor retinaculum and was spared.
D) The inability to hold the piece of paper was caused by the paralysis of the second palmar interosseous muscle, which is supplied by the deep branch of the ulnar nerve.
E) There was no sensory loss on the palm of the hand because the palmar cutaneous branch of the ulnar nerve was not cut.