Answer:
C. It allows people's personal preferences to affect their
interpretation of events.
Explanation:
If you have bias against or for something, chances are you have strong feeling or thoughts against it. Historians can be on the lookout for an emotional description that shows a strongly positive or negative tone toward an event. A description that is extremely judgmental was probably written by someone who had a strong point of view about the event and may have created a biased account of it. Historians can also study a person's cultural, religious, social, and economic background to help them be aware of what biases to watch out for.