Which of the following contains a vague pronoun reference?
A: Tommy and his best friend go to the same college, but he is graduating this coming June.
B: Tommy and his best friend go to the same college, but Tommy is graduating this coming June.
The second answer choice contains a vague pronoun reference. The pronoun he could refer to Tommy or his best friend.
The first answer choice shows a possible correction for the vague pronoun reference. He has been replaced with Tommy.
Tommy and his best friend go to the same college, but Tommy is graduating this coming June.