Janice Is Conducting a Single-Subject Study with Four Speech and Language

Janice is conducting a single-subject study with four speech and language support students with speech disfluency. She wants to examine a new strategy to assist students' stuttering. She collects baseline data by observing the stuttering of her student in the general education classroom twice and then starts the new intervention strategy in the support classroom for 6 sessions. Meanwhile, she observes classroom stuttering. Next, Janice discontinues the new strategy during the support sessions but continues to collect data in the classroom setting two more times. Which of the following designs is Janice's study?

A) A-B
B) A-B-A
C) B-A-B
D) A-B-A-B