Which of the following is a dependent clause? at the mall
shopping at the mall
after they went shopping at the mall
Del and Kay ate lunch after they went shopping at the mall

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

they insisted that there was not enough time to learn everything.  

explanation:

if they were going to steal the answers that is simply because they insisted that there was not enough time to learn everything.