Who Is Using a Longitudinal Research Design

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