Final answer:
Under the fair use principle, copyrighted material can be used if proper citation is given and fair use criteria are met, not based on the proportion used, payment, or absence of criticism. The correct option is b.properly cite the source.
Step-by-step explanation:
According to Stanford University Libraries, under the principle of fair use, a person may use copyrighted material when they provide proper citation for the source and adhere to specific guidelines. It is not about using more than half of the information, paying the author for the information, or refraining from criticizing the source.
The fair use doctrine considers factors such as the purpose and character of the use, the nature of the copyrighted work, the amount and substantiality of the portion used, and the effect on the work's value. When invoking fair use, the intent is typically for purposes such as criticism, comment, news reporting, teaching, scholarship, or research, and the user must ensure proper acknowledgment of the source.