epigastric pain and mass

[Su bin Son]

Here is a question from Korean medical liscencing exam.
There are many debates about answer of this question.
So I wanna hear you about this.
Q. 43/M epigastric pain and mass. On physical exam, tenderness and mass are observed. what are possible disease?
a.duodenal ulcer b.acute pancreatitis c.cholangiocarcinoma d.abdominal trauma

1.a,b,c
2.a,c
3.b,d
4.d
5.a,b,c,d

In a book, the answer is 3. but aren't all possible?