Which of the following studies is an example of a longitudinal design?
a. dr. stabler’s study in which he measured teenagers’ experiences with bullying in sixth grade and their aggressive tendencies in 12th grade.
b. dr. jonason’s study in which he measured job satisfaction in a group of chinese factory workers and in a group of american factory workers.
c. dr. tutola’s study in which he measured men’s ability to judge distances and compared those to women’s abilities in the same area.
d. dr. benson’s study in which she measured people’s spatial manipulation ability in august and measured their ability again in may after they had taken two semesters of art classes.