Which Statement Accurately Captures Why Within-Groups Designs Are Preferred Over

Which statement accurately captures why within-groups designs are preferred over between-groups designs?

A) Variability due to participants' differences is held constant across levels of the independent variable in the within-groups design, resulting in less within-groups variability.
B) Loss of participants has a more significant negative impact on between-groups designs as compared to within-groups designs.
C) Control of extraneous variables is easier when using between-groups designs than within-groups designs.
D) Within-groups designs take less time than between-groups designs.