Based on the given sentence above, the appositive phrase here is the "triplet sisters". When we say appositive, this is a word or phrase that renames the subject that follows it. In this case, this appositive renames <span>"Laura, Lisa, and Lynn". Hope this answers your question.</span>
<span>When writing nonfiction, an author has far more freedom to move around from one setting to another. This is not something fiction writers can often do - if the story is located in one place, it's not easy for the author to suddenly just change the location where the story is told the way nonfiction authors can. However, nonfiction writers do not have such liberties to present conflicts, use their imagination, or change their characters the way fiction authors can.</span>
I personally think that the answer is C