Choose the set of words that is an adjective clause: i hardly recognized my car, which had undergone a complete make-over.
a) i hardly recognized
b) recognized my car which had
c) my car which had undergone a complete
d) which had undergone a complete make-over

The correct answer is D)which had undergone a complete make-over.

An adjective clause is, basically, an expanded adjective. It provides a description of the subject or object of the main clause. For example, this adjective clause could easily be replaced with a simple adjective. It is a clause, and not a phrase, because it has a predicate ("had undergone"). It is a dependent clause because it can't stand on its own, unlike the main clause.