Which Statement About the Study on the Development of Popularity

Which statement about the study on the development of popularity discussed in the text is true?

A) The microgenetic design allowed for conclusions to be made about age-related changes in popularity.
B) The cross-sectional design allowed for age-related differences among children in popularity to be examined.
C) The longitudinal design allowed for the investigation of how changes in popularity occur.
D) The longitudinal design allowed for the stability of individual differences to be examined.