A Researcher Has Developed a Device to Prevent Snoring

Multiple Choice

A researcher has developed a device to prevent snoring.The device works immediately when it is put on,but has no lasting effect when it is removed.The researcher decides to evaluate this device with a single-subject design.Which design is most appropriate?​

A) ​ABAB design
B) ​multiple-baseline design
C) alternating treatments design
D) ​changing criterion design