A.

always influences the dependent variable

B.

is the same for all groups in an experiment

C.

is influenced by the dependent variable

D.

is manipulated or varied by researchers

Thanks to anyone who helps! :)

always influences the dependent variable

B.

is the same for all groups in an experiment

C.

is influenced by the dependent variable

D.

is manipulated or varied by researchers

Thanks to anyone who helps! :)