A major advantage of community trials is that they are: A. able to control delivery of the intervention to many study units. B. able to estimate directly the realistic impact of behavior change. C. able to randomize subjects precisely to the study conditions. D. all of the above Solution D.all of the above.

1. A major advantage of community trials is that they are:
A. able to control delivery of the intervention to many study units.
B. able to estimate directly the realistic impact of behavior change.
C. able to randomize subjects precisely to the study conditions.
D. all of the above
Solution
D.all of the above