The following views depict various postoperative appearances of the stomach. For each view, identify the procedure and name the condition the procedure is most often used to treat.

A. Billroth I procedure (gastroduodenostomy), used to treat peptic ulcer disease 
B. Roux-en-Y procedure (gastrojejunostomy), used to treat peptic ulcer disease 
C. Billroth II procedure (gastrojejunostomy), used to treat peptic ulcer disease 
D. Whipple’s procedure (pancreaticoduodenectomy), often used to treat resectable pancreatic carcinoma in the pancreatic head