What is the appositive in the sentence below?

Our neighbor, Mrs. Eddy, is an editor

A) Mrs. Eddy

B) Our

C) Editor

D) Neighbor

Is A, because an appositive is the word (s) which follow a noun to rename it or describe it in another way. Appositives are usually offset with commas, brackets or dashes.

The appositive in the sentence above is "Mrs. Eddy" (A).

Explanation:

An appositive is a noun or noun phrase that renames another noun right beside it. In the sentence above, the appositive is the NP "Mrs. Eddy" and it renames the NP "our neighbor". What is more, the appositive phrase is nonessential since the information it provides is not considered relevant to complete the meaning of the sentence. If it was dropped, the meaning would be left unchanged (1). That is why it is offset with commas.

1) Our neighbor is an editor