-Which Term Most Accurately Describes the Following Definition? "Analysis Based

-Which term most accurately describes the following definition? "Analysis based on aggregated or grouped data; errors in inference may result because associations may be artifactually created or masked by the aggregation process." [Porta M,ed.A Dictionary of Epidemiology.New York: Oxford University Press; 2014.]

A) Ecologic study
B) Cross-sectional study
C) Case-control study
D) Cohort study
E) Randomized trial