A Selection Bias Occurs When

Multiple Choice

A selection bias occurs when

A) researchers use a different version of the dependent measure at the posttest than at the pretest.
B) research participants in the control condition of an experiment differ in some way from the participants in the experimental condition.
C) the dependent variable in a study is assessed by having research participants choose between performing two or more behaviors.
D) researchers choose one operational definition of a dependent variable over another rather than using multiple operational definitions.