Who Is Using a Longitudinal Research Design

Multiple Choice

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 2003, and plans to assess 60-year-olds' eating habits in 2008 and 80-year-olds' habits in 2013