The answer is A, because it has no errors.
Muckalize means to damage or to make a mess of. Hope this helps! :)
It means to give credit to the author and source. It helps in an argument because when you're trying to prove a point, you have to have factual evidence that proves you're right.
Not really because it depends on how your interview goes and if the person who’s interviewing you likes how you are and if you’re perfect for the job. Sometimes it could be the persons fault who’s interviewing you and yourself also. Hope this helps