What Is the Key Element in a Double-Blind Control Study

What is the key element in a double-blind control study?

A) Neither the treatment provider nor the research participants know whether the treatment will be effective.
B) Neither the treatment provider nor the research participants can ever be made aware of the research findings.
C) Neither the treatment provider nor the research participants are aware of who is in the treatment group and who is in the control group.
D) The research participants are not aware that they are participating in a research study.

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