41 LR One Question 12
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Comments

Thank you for this explanation! I definitely see why C is wrong and why E is right - it eliminates the possibility of an alternate cause. Could you possibly briefly explain why D is wrong? I see that it wouldn't help eliminate the possibility that even those on the bad diet became less violent, but I thought it might help eliminate a different alternate cause - the possibility that behavior improved because they were being shown more attention/being put in a special program.

Yeah, I like your thinking, but in order for (D) to really say what you're wanting it to say, it would have to not only tell us that many of them were nonviolent, but that they were less violent as a group than the inmates who didn't choose (or weren't forced) to eat bad food. Without the comparison, (D) doesn't give us enough information to help.