Question

longitudinal research involves multiple choice uncovering unconscious motives and conflicts observing and measuring the same variables periodically over time the random selection of participants within a particular population randomly assigning participants to the control and experimental groups

Explanation:

Longitudinal research is defined as a study design that follows and assesses the same subjects or variables repeatedly across an extended period. The other options describe different research approaches: uncovering unconscious motives relates to psychoanalytic methods, random participant selection is sampling, and random assignment to groups is an experimental design technique.

Answer:

observing and measuring the same variables periodically over time