Monique is writing a research paper on the Holocaust. She interviewed her next door neighbor’s grandfather who is a concentration camp survivor. When she included a quote from his interview in her research paper, she forgot to include a citation.

Is this plagiarism? Why or why not?
A.
Yes, because she acknowledged the source.
B.
No, because she acknowledged the source.
C.
No, because she innocently forgot, and since it was an honest mistake, it is not plagiarism.
D.
Yes, because even though she innocently forgot, she still neglected to give the appropriate person credit.