What Is the Purpose of "Blinding" the Experimenter to the Conditions)

Multiple Choice

What is the purpose of "blinding" the experimenter to the conditions) his or her participants are experiencing?

A) knowledge of these conditions invalidates the experiment
B) it makes the IV stronger
C) if the experimenter knows this information, it will affect the way he or she interprets the data once they are analyzed
D) knowing this information may cause the experimenter to behave differently toward participants in the different conditions