I'd go with
(B) as well
Quoting the original stem: "When school administrators translate educational research into a standardized teaching program and mandate its use by teachers, students learn less and learn less well than they did before, even though the teachers are the same. The translation by the administrators of theory into prescribed practice must therefore be flawed."
Bare-bone paraphrasing: Students learn less through study material which results from the translation of research into std teaching prog.
Therefore, the translation
MUST be flawed.
The conclusion is that the translation must be flawed. Using the CPA (Conclusion-Premise-Assumption) approach, let us break this process down: We start off with
Educational research -> std teaching programs -> taught by teachers -> to students.
Now, the first conversion (from educational research to std teaching prog is flawed) and hence, the students end up learning less. Therefore, there is no loss of efficiency in the remaining steps (sorry to repeat this point, but just for the sake of clarification).
Examining our finding above, let us evaluate the options:
(A) - ruled out. Against our finding that there is no loss of efficiency from teacher -> student
(B) - Keep it: The educational research is sound; this implies that students are indeed learning less because of the loss of efficiency in the translation process
(C) - ruled out: We're not looking for recommendations to improve the process. We're looking for assumptions
(D) - ruled out: same argument as (A)
(E) - ruled out: completely irrelevant
Thus, by POE, we can zero in on (B), though it's still a pretty vague assumption. Nevertheless, we have to live with the lesser devil - that's the principle of the ETS.
Please put in your views - this is an interesting CR.