Which of the Following Is an Example of Experimenter Bias

Multiple Choice

Which of the following is an example of experimenter bias

A)  An experimenter explicitly instructs subjects to complete tasks in a particular order, rather than allowing them to choose the order of completion. 
B)  An experimenter tries to make a favourable impression on the research subjects by being friendly and by providing a great deal of information. 
C)  An experimenter conducts her study in a completely objective manner. 
D)  An experimenter's belief in his own hypothesis affects either the subjects' behaviour or his observations of the subjects.