With Regard to Evaluation Designs,which of the Following Statements Is

Multiple Choice

With regard to evaluation designs,which of the following statements is not accurate?

A) variation in the levels of treatment delivered by a program can be a major threat to the validity of even randomized evaluation studies
B) uncontrolled variation in treatment is equivalent to unreliable measurement of the independent variable
C) controlled variation in treatment represents a threat to generalizability
D) varying degrees of participation by clients in a program will impact the outcome