Final answer:
Dr. D. Termined will most likely use the longitudinal research design to follow the 2010 class of gerontology graduates across the decade after their graduation.
Step-by-step explanation:
Dr. D. Termined will most likely use the longitudinal research design to follow the 2010 class of gerontology graduates across the decade after their graduation. Longitudinal research involves repeatedly gathering data from the same group of individuals over an extended period of time. In this case, Dr. Termined can survey the graduates about their experiences and outcomes at various time points, such as 1 year, 5 years, and 10 years after graduation.