You can use the (Unique) constraint to compare one column against another column. Hope I got it right.
Answer:
I will give you a link in the comments to help you with this writing.
Explanation:
I hope it helps u! :D
I believe the answer is A because the more clear and concise(brief) you are, the better your resume will look.
Not washing your hands thoroughly. Also being around someone with the flu, touching something with the flu virus on it then touching your eyes, nose or mouth (mucas membrane areas) wouls cause you to get flu