A team of researchers are interested in studying changes in parenting style over time, as children and parents grow older. One researcher states, if we choose a ________, then it would be less time consuming and expensive. Another researcher comments, If we choose that design, then we have measurements of parenting style for one point in time, and we can't be sure about changes with age over time. They are discussing the advantages and disadvantages of which research design?
A. Sequential research design.
B. Longitudinal research design.
C. Cross-sectional research design.
D. Cohort sequential research design.