Based on the Editors' Previous Research and Literature Reviews, Which

Based on the editors' previous research and literature reviews, which statement best articulates a concern they identify in how theories are applied?

A) Too many studies are focused on the policy and community levels and not on the individual and interpersonal levels
B) Many studies testing theory omit some key constructs from within the model being studied
C) There has been an over-reliance on using experimental research designs
D) Researchers have focused almost exclusively on maintaining high external validity
E) None of the above statements are of concern