Answer:
The answer is indeed letter C. the attitudes or beliefs that prevent a writer from giving a subject objective consideration.
Explanation:
Bias is a preconceived opinion, a tendency to believe something is true/false, right/wrong that comes from previous experience/knowledge - or lack of it. A bias can be projected toward anything: race, sexual orientation, ideas, beliefs. People who present a bias find it difficult to approach a subject with objectivity, since their preconceived ideas will influence their opinions and writing process. For example, an author who has a strong bias against the government of his country will probably find reasons for criticism even when the government does find a good solution for a problem afflicting the people.
