14. which is a sentence fragment? watching a scary film with my friends at the theater. it’s overdue. if you do not understand, ask your teacher for . call me.

A sentence fragment is a part of a sentence - it cannot exist on its own, but rather has to be included within a larger sentence in order to make sense. Having this in mind, the correct answer is Watching a scary film with my friends at the theater.
This fragment doesn't have a verb at all, which is why it is a fragment rather than a clause, like the other options.