The author and page number. Sometimes the source such as a book, newspaper, or article where it came from.
Common essay citation example:
"I see a world on the edge of a blade.Without balance, it will fall." (Aveyard,p.126) < page number
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author's last name
I suggest either talking or emailing the person grading the exam or someone who could help you.
What are the answer choices sir or maam