1-85A Researcher Says,"These Studies Make It Too Easy for Investigators

1-85.A researcher says,"These studies make it too easy for investigators to find the background factors they expect to find.However,they are more valid if we find documents like school reports that show the background factor before the disorder emerges." What kind of research strategy is the researcher referring to?

A) Prospective strategies
B) N=1 strategies
C) Retrospective strategies
D) Analogue studies