The sentence, “after the phone rang” is a dependent clause because it just has a predicate, with no subject (who or what the story is about)
Here you go! Hope this helps....
What's the article and what's the choices? I'd be happy to help!
I agree. abc should be the right answer mainly because he was preoccupied with the girl, confused she left and indecisive on whether she is real or just a figure of his imagination