Which of the Following Is an Advantage of Correlated-Groups Designs

Multiple Choice

Which of the following is an advantage of correlated-groups designs?

A) Correlated-groups designs help to control participant (subject) variables.
B) Correlated-groups designs are better than independent-groups designs when the researcher cannot remove the effects of the IV.
C) Correlated-groups designs use random assignment and independent-groups designs do not.
D) All of the above are advantages of correlated-groups designs.