The correct answer is B. Bias is the set of preferences or prejudices a writer has about a subject.
Step-by-step explanation:
In social studies, bias is a common phenomenon that occurs as historians, geographers, etc. allow their preferences, prejudices, and belief to influence their work, this implies they do not write objectively about a subject. Bias is common in all fields and resources including primary and secondary resources. In the case of primary sources, this is common because the author register events from his/her perspective, while in the case of secondary sources, the sources selected, information included and the way individuals analyze or summarize this information can be influenced by bias. According to this, the statement that is true about bias in social studies is "Bias is the set of preferences or prejudices a writer has about a subject".