Which of the following contains a vague pronoun reference?
A: Nick waved goodbye to Tyler as his train pulled out of the station.
B: As Tyler's train pulled out of the station, Nick waved goodbye to him.
The second answer choice contains a vague pronoun reference. The pronoun his could refer to Nick or Tyler.
Nick waved goodbye to Tyler as his train pulled out of the station.
The first answer choice shows a possible correction for the vague pronoun reference. The text has been rewritten so that the meaning is clear.
As Tyler's train pulled out of the station, Nick waved goodbye to him.