Answer:
The appositive phrase in this sentence is the one between commas <em>"the messiest room in the house"</em>
Explanation:
An appositive phrase provides more information, renames or identifies the previous noun or noun phrase. In this case it identifies <em>Gordon´s room</em> as the <em>messiest room.</em>
So the possible answer among the questions you give are the following:
1. What are text feature?
- D. Items such as the author's name and publication city
2.Which of the following is an example of a common useful text feature?
-C. Glossary.
I hope you are satisfied with my answer and feel free to ask for more if you have more clarifications.
D is the answer because nothing else makes sense
