Athena Is Designing a Study to See How People's Head

Multiple Choice

Athena is designing a study to see how people's head circumferences change between childhood and adulthood.Unfortunately,she has only a few months in which to perform her study,so she decides to measure groups of 100 5-year-old children,100 10-year-old children,100 15-year-old children,100 20-year-old adults,100 25-year-old adults,and 100 30-year-old adults.Her research design is

A) cross-sectional.
B) longitudinal.
C) latitudinal.
D) cross-sequential.