Answer:
C. after they went shopping at the mall is the dependent clause.
Explanation:
A dependent clause is defined as a group of words that contain a subject and a verb. They also don't express a complete thought and can't stand alone.
Option A doesn't have a subject or a verb, Option B doesn't have a subject, and Option D expresses a complete thought.
Therefore, C. is the correct answer.
Hope this helps! :D
