Which of the following contains a vague pronoun reference?

 - Leah told Mia that the fleece jacket on the bench looked like hers.
 - The fleece jacket that Leah saw on the bench looked like Mia's.
The second answer choice contains a vague pronoun reference. The pronoun hers could refer to Leah's or Mia's.
Leah told Mia that the fleece jacket on the bench looked like hers.
The first answer choice shows a possible correction for the vague pronoun reference. The text has been rewritten so that the meaning is clear.
The fleece jacket that Leah saw on the bench looked like Mia's.