Which of the Following Is an Example of Observer Bias

Multiple Choice

Which of the following is an example of observer bias?

A) You develop an opinion of what you expect to see in an experiment.
B) You ask your fellow students to be participants in a study of adult memory.
C) You ask people from your church to participate in a study of family values.
D) You allow a student to quit an experiment simply because he or she is bored.