Which of the following contains a vague pronoun reference?

 - Andy sent them the transcript from his old college, but he still wasn't granted an exemption from English 101.
 - Andy sent the registrar's office the transcript from his old college, but he still wasn't granted an exemption from English 101.
The second answer choice contains a vague pronoun reference. The pronoun them is used without its antecedent.
The first answer choice shows a possible correction for the vague pronoun reference. Them has been replaced with the registrar's office.
Andy sent the registrar's office the transcript from his old college, but he still wasn't granted an exemption from English 101.