I believe the answer is b or c
The purpose of your essay is determined by your goal as a writer, as well as your subject matter. There are numerous types of essays, but essays usually fall under one of the following purposes for writing: to inform, persuade, explain or entertain.
Answer:
explain *i'll edit my answer
Explanation:
it is a phrase becuase a phrase is a group of words that may contain either a subject or a verb but not both and the sentence "swimming laps at the pool" only contians a subject becuase, who is swimming laps at the pool?
Each of them want to kill the other treachery