Mary Discovered That Her 7-Year-Old Daughter,Maggie,was Especially Motivated by Money

Mary discovered that her 7-year-old daughter,Maggie,was especially motivated by money.Mary began a reinforcement program whereby Maggie earned 5 cents every time she brushed her teeth.A month later,Mary instituted a payment schedule of 10 cents every time Maggie went to bed on time without complaining.Once these behaviours were firmly established,Maggie began earning money for every book she read.What kind of single-subject design did Mary employ?

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

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