An Elderly Male Had Rectal Bleeding

An elderly male had rectal bleeding. A flat velvety mass was observed in the cecum. The provisional diagnosis was villous adenoma. A partial colectomy was performed. Invasion through the muscularis mucosae, but not into the muscularis propria, was observed on paraffin sections. Therefore, the final diagnosis was:

A) pseudopolyp
B) adenomatous polyp
C) adenocarcinoma Dukes A
D) adenocarcinoma Dukes B
E) adenocarcinoma Dukes C