Which of the Following Statements Is TRUE About Ecological Model

Which of the following statements is TRUE about ecological model interventions?

A) Most evidence of effectiveness has come from cross-sectional studies
B) It is difficult to integrate individual level theories into ecological model interventions
C) Although widely used, there is little evidence of their effectiveness in improving health outcomes
D) Individual level changes are likely more effective in promoting sustained behavior change than environmental and policy levels changes
E) Ecological models are widely used and most national funding agencies prefer funding multi-year studies