Dr. kang studies the development of morality in children. in her latest study she followed and assessed 3- year-olds, 4-year-olds, and 5-year-olds for a period of time. the 3-year-olds were tested at ages 3, 4, and 5; the 4-year-olds at 4, 5, and 6; and the 5-year-olds at ages 5, 6, and 7. this is an example of a research design.

Dr. Kang’s research where she followed and assessed 3- year-olds, 4-year-olds, and 5-year-olds for a period of time is an example of a sequential research design.

This type of research design integrates both cross-sectional and longitudinal design and targets to correct some problems of cross-sectional and longitudinal designs.

this doesn't support enough information to answer the question.

if im not mistaken its a. collective emotional arousal