In a Double-Blind Study

In a double-blind study,

A) only the experimenter knows which subjects are assigned to which group; neither her research assistants nor the subjects know about the group assignments.
B) neither the experimenter nor the subjects know about group assignments.
C) neither the experimenter's research assistants nor the subjects know what the dependent variables are.
D) the main goal is to prevent subjects' expectations from influencing their behaviour.
E) the experimenter is not aware of assignment to the control group OR the experimental groups.