Leon Has Been Struggling with the Onset of Early Dementia

Multiple Choice

Leon has been struggling with the onset of early dementia. He is having a very hard time remembering his address, his grandchildren's names, and his daily routine. Leon was accepted into a clinical trial for a new drug to test its effectiveness compared with other medications on the market in slowing down the symptoms of dementia. Leon would transition to each medication group every 3 months. In each group Leon was initially assessed with periodic neurocognitive assessments to monitor any change. Leon was part of which type of research design?

A) mixed factorial design
B) between-subjects design
C) within-subjects design
D) quasi-experimental design