The correct answer is C. The idea of bias refers to a concept formed prior to or antecedent to the finding of the facts. Honesty is a facet of the moral character that connotes positive and virtuous attributes such as integrity, truthfulness, straightforwardness, including straightforwardness of conduct, along with the absence of lying, cheating, theft, etc. Honesty also involves being trustworthy, loyal, fair, and sincere. How can someone affirm about student´s honesty answering questions before applying the questionary? So, this affirmative has potential sources of bias on it.