Maggie, a graduate student at a local university, is interested in the impact on intelligence of the no child left behind legislation. so she gives an intelligence test to people ranging in age from 15 to 45. maggie is conducting a(n) study.

Maggie, a graduate student at a local university, is interested in the impact on intelligence of the no child left behind legislation. so she gives an intelligence test to people ranging in age from 15 to 45. maggie is conducting a cross sectional study. It is also known as a cross-sectional analysis, transversal study, prevalence study. It is also  a type of observational study which  analyzes data collected from a population, or a representative subset, at a specific point in time—that is, cross-sectional data.

Icould be wrong but i would say b.