A 46-Year-Old Man Had Been Treating Himself for Hemorrhoids for the Past

A 46-year-old man had been treating himself for hemorrhoids for the past 3 years. He had noticed that his feces were often slightly blood stained. For the past 12 months, he had noticed that when he had his bowels open, he always felt that more was to come. Sometimes he went to the toilet several times a day but was only able to pass flatus and blood-stained mucus. Recently, pain had developed down the outside of his right leg. Digital examination of the rectum revealed a large, hard-based ulcer on the posterior wall of the rectum with extensive induration of the pararectal tissues. A diagnosis of advanced carcinoma of the rectum was made.
-The following statements about this patient are probably correct except which?

A) Some of the bleeding was from the carcinomatous ulcer of the rectum as well as from the hemorrhoids.
B) The lymphatic drainage of the rectum takes place first into the pararectal lymph nodes.
C) Carcinoma of the rectum never metastasizes to the liver.
D) Examination of the right leg revealed some weakness of the muscles supplied by the sciatic nerve.
E) The carcinoma had extended posteriorly to involve the sacral plexus.
F) The patient indicated that the leg pain was felt in skin areas supplied by branches of the sciatic nerve.