In Nutritional Anthropology, Longitudinal Studies Involve

In nutritional anthropology, longitudinal studies involve

A) studying the same set of children at repeated age intervals.
B) studying equal numbers of infants, children, adolescents and adults.
C) sampling children from different longitudes in the Eastern and Western hemispheres.
D) sampling equally from different age groups within a population and then testing for differences between age groups.
E) introducing nutritional supplements to a population and then charting the effects.