Which of the Following Is an Example of Demand Characteristics

Which of the following is an example of demand characteristics affecting an experiment?

A) An experimenter draws the wrong conclusions from a study because she did not use the correct statistical analysis.
B) A participant changes his response to a question because he has the feeling that the experimenter wants him to do so.
C) An experimenter stops using a test because it does not appear to be reliable.
D) A participant in a double-blind experiment believes she is in the control group.