What form or rule demonstrated in this sentence is identified by one of the selections below?

Question

The tiny, insignificant twitch of his right eyebrow gave him away to the detective, a man of about forty.
appositive
direct address
interruption

Answer 1

The form or rule demonstrated in the sentence is appositive. An appositive is a noun or noun phrase that renames or clarifies another noun right beside it. In this case, "a man of about forty" serves as an appositive that provides more information about "the detective."