Professor Aaron Finds That When He Smiles and Makes Eye

Multiple Choice

Professor Aaron finds that when he smiles and makes eye contact with Jeanne, she becomes more responsive to his questions. He tries the same behavior on David, Chris, and B.J. and finds that it also influences their responses to his questions. What type of single-case design did Professor Aaron employ?

A) Across situations ABA design
B) Across behaviors multiple-baseline design
C) Across subjects multiple-baseline design
D) Across subjects ABA design