Final answer:
Periodicals should be limited due to potential bias; scholarly articles, typically peer-reviewed, offer more objective and credible information for research. A is the correct answer.
Step-by-step explanation:
The question asks which type of articles should be limited in use because they can have a hidden agenda or be slanted to a particular point of view.
The correct answer is periodicals, which contrast with scholarly articles that are typically written by academic researchers and peer-reviewed for credibility.
While periodicals can provide a general understanding of a topic, they often cater to a wider audience and may not have the objectivity required for scholarly research. It is crucial to evaluate the purpose, authorship, and balance of fact and opinion when considering sources for research to identify and avoid bias.