How Does Randomization Work to Control Extraneous Variables

Multiple Choice

How does randomization work to control extraneous variables?

A) The researcher uses different treatment sequences in order to control order effects.
B) The researcher ensures that all groups receive the extraneous variables to the same extent.
C) The researcher creates a constant or uniform condition to control an extraneous variable.
D) Because all participants have an equal likelihood of being in any group, any individual differences associated with the participants should be equally distributed across the groups.