Who is using a longitudinal research design?
A. George, who is assessing eating habits of 40-year-olds in three different countries
B. Jane, who is assessing the eating habits in a group of 40-year-olds, and who will follow and assess this same group when they get to ages 60 and 80
C. Elroy, who is simultaneously testing the eating habits of 40-, 60-, and 80-year-olds
D. Judy, who is assessing the eating habits of 40-year-olds in the year 2014, and plans to assess 60-year-olds' eating habits in 2019 and 80-year-olds' habits in 2024
Answer: B
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