What is an appositive?
-A word that describes a verb.
-A word that describes a noun.
-A word that describes another word.
-All of the above.
4 answers
http://www.chompchomp.com/terms/appositive.htm
So C, got it.
http://www.grammar-monster.com/glossary/appositive_apposition.htm
C is not right. I'm sorry you didn't understand the website I posted for you.