Of the following sources, where might you expect to find biased information?

While you didn't provide any possible sources, we can expect that biased information would be found when you would look for information from people who are involved in the situation that is being discussed. Imagine a soldier from Germany discussing his viewpoint of World War II. He would most likely give you a biased account. At least, when compared to a postwar historical analysis of that same situation. 

The answer is c. good luck : )