A 63 year old woman admitted with a two hour history of sudden onset severe epigastric pain and haematemesis

a 63 year old woman admitted with a two hour history of sudden onset severe epigastric pain and haematemesis. She is a smoker and her only past medical history is poorly controlled rheumatoid arthritis. Examination reveals an extremely tender epigastrum, a rigid abdomen and absent bowel sounds. An erect chest radiograph demonstrates gas under the diaphragm. Where is the most likely site of primary pathology?
A Esophagus

B First part of the duodenum
C Gastro-esophageal junction
D Second part of the duodenum
E Stomach