Which Scenario Best Describes a Double-Blind Study

Which scenario best describes a double-blind study?

A) The investigator and the subjects wear blindfolds.
B) No one knows who is in the experimental or control groups
C) The subjects do not know if they are in the experimental or control groups.
D) Neither the investigator nor the subjects know who is in the experimental or control groups.
E) The investigator does not know if subjects are in the experimental or control groups.

Correct Answer:

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