Holding Extraneous Variables Constant as a Means of Controlling Their

Multiple Choice

Holding extraneous variables constant as a means of controlling their effects may have the undesirable side effect of

A) limiting the internal validity of the experiment by creating treatment confounds.
B) increasing the complexity of the experiment.
C) creating order effects that then have to be controlled.
D) limiting the generalizability of the conclusions that one can draw from the experiment.