Which of the Following Is NOT an Example of Plagiarism

Multiple Choice

Which of the following is NOT an example of plagiarism?

A) Abby buys a term paper on the Internet and turns it in as her own work.
B) Luke borrows a tune from another band and incorporates in his own songwriting without permission.
C) Toby gives a speech that he got from a book of famous speeches, and acts as if it was his writing.
D) Shelly fails to prepare for a test and bubbles in answers randomly.