Final answer:
The Washington Post is not considered a scholarly source as it is a mainstream newspaper, unlike the other options listed which are scholarly, peer-reviewed journals. The correct option is C.
Step-by-step explanation:
The following is not considered to be a scholarly source: c. The Washington Post. The American Journal of Political Science, The American Political Science Review, and The Journal of Politics are all scholarly sources typically consisting of peer-reviewed articles and academic research.
However, The Washington Post is a mainstream newspaper that provides a mix of news, opinion, and analysis, and is not a peer-reviewed scholarly source in the context of academic research.