The second answer choice contains a vague pronoun reference. The pronoun it could refer to Lila's skirt or the blouse.
The first answer choice shows a possible correction for the vague pronoun reference. It has been replaced with the blouse.
If Lila's skirt doesn't match the blouse, she will have to exchange the blouse for another item.
Which of the following contains a vague pronoun reference?
A: If Lila's skirt doesn't match the blouse, she will have to exchange the blouse for another item.
B: If Lila's skirt doesn't match the blouse, she will have to exchange it for another item.