Randomisation Is Used to Assign Research Participants to Groups in Order

Randomisation is used to assign research participants to groups in order to

A) prevent assembling groups that differ in a way that may influence the research outcome.
B) make sure that all participants in the study are the same with respect to the dependent variable when the study is concluded.
C) make sure that all participants are the same with respect to the independent variable before the study begins.
D) prevent any differences in the way the independent variable is manipulated for all research subjects.