Which of the Following Is a Difference Between ABAB Designs

Multiple Choice

Which of the following is a difference between ABAB designs and multiple-baseline designs?

A) ABAB designs have a maximum of two intervention phases, whereas in multiple-baseline designs, the intervention phases are applied to different dependent measures simultaneously.
B) ABAB designs identify causal relationships by withdrawing the intervention and reversing the change, whereas multiple-baseline designs determine causality by identifying changes in some but not all of the multiple dependent measures.
C) ABAB designs involve the use of multiple criterion variables, whereas multiple-baseline designs involve the use of multiple predictor variables.
D) ABAB designs are free of threats to internal validity, whereas in multiple-baseline designs, there is a possibility of threat to internal validity even if the dependent variables are mutually independent.