A 30-Year-Old Man Involved in a Barroom Brawl Was Seen

A 30-year-old man involved in a barroom brawl was seen in the emergency department. He was found to have a bloodstained tear on the seat of his trousers and lacerations of the anal margin. During the fight he was knocked down and fell in the sitting position on the leg of an upturned bar stool. While under observation he developed the signs and symptoms of peritonitis.
-The signs and symptoms displayed by this patient could be explained by the following anatomic statements except which?

A) The patient had impaled his rectum on the leg of the upturned bar stool.
B) At operation, a laceration of the anterior wall of the middle of the rectum was found.
C) The leg of the bar stool had entered the rectovesical pouch.
D) The rectal contents had contaminated the peritoneal cavity and were responsible for the development of peritonitis.
E) The anterior surface of the middle third of the rectum has no peritoneal covering.