Concept:The sons of Jacob are listed in order of birth, with Benjamin as the last and twelfth son.
Explanation:Jacob’s twelve sons in birth order are: Reuben, Simeon, Levi, Judah, Dan, Naphtali, Gad, Asher, Issachar, Zebulun, Joseph, and Benjamin.
Therefore, the twelfth son of Jacob is Benjamin.
Answer:A. Benjamin