The BEST Definition of a Double-Blind Study Is Research in Which

Multiple Choice

The BEST definition of a double-blind study is research in which _____.

A) nobody knows what they are doing
B) the participants in the treatment group, as well as the participants in the control group, are unaware of the group to which they belong.
C) both the researcher and the participants are unaware of who is in the experimental and control groups
D) two control groups (or placebo conditions) must be used