Answer:
B.
Explanation:
Re-using of own previous class works or assignment without proper citation is known as self-plagiarism.
So, as per the given scenario, if one would not cite yourself, then he/she is committing self-plagiarism.
When one is using some sections from previous papers of one own's work, even if it is not published, he/she needs to consider himself/herself as an author of that paper and included proper citations of self-work to avoid self-plagiarism.
The guidelines of self-citation can be found in APA citation format or can be inquired of the teacher how to cite yourself.
Thus the correct option is B.