What pieces of art should I use in a Graphic Design portfolio for college?

I have an interview for college in a few weeks for four subjects: Business & Economics, Art and Design, English Literature & Language and Graphic Design.

I have good ideas on what to use for my art and design portfolio, but what should I use for my graphics design one? What do they look for in a portfolio? Is there anything specific that makes them interested in the applicant? I'm rather nervous about my interviews so any help would be greatly appreciated.
 
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