In a Longitudinal Study of a Behavior, a Researcher Would

Multiple Choice

In a longitudinal study of a behavior, a researcher would

A) select groups of participants from each age group and study each group at one time.
B) observe and participate in the behavior in question.
C) measure the degree to which the behavior changed when a factor thought to influence it also changes.
D) study one group of similarly aged people multiple times over a long period of time.