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Is anyone able to explain not just why AC B is correct, but why AC A is incorrect?
My understanding from the question stem is that the correct answer choice will be one that establishes either one of the two plans (demolition or rehabilitation). I chose AC A because I reasoned that the principle established that rehabilitation should occur UNLESS the neighborhood association deems the buildings a threat (which they do). So if the neighborhood deems the houses in question a threat, then they should not be rehabilitated, and if there are only two options: demolition or rehabilitation, then demolition would need to take place.
My guess as to why AC A is incorrect is because AC A only rules out rehabilitation as a possibility and does not establish that demolition will occur. AC B used some tricky language and it established that rehabilitation should occur and that makes sense, but unfortunately I read AC A first and understood it as establishing reason for demolition so I was biased in evaluating answer choice B. This question stem was especially odd so I am not very worried about getting confused by it but I would still like to understand this question better.
AC A is incorrect because it is a general principle. A sounds good inside a vacuum but consider another disease. Disease "A" and disease "B" could have wildly different treatments. In an extreme scenario, the treatment for disease "A" could have an adverse effect and kill a patient with disease "B". Hence, in this hypothetical (to which the principle in AC A applies) it would be more important to distinguish between disease "A" and "B". The principle in AC A is attractive because it does apply to the situation posed in the stimulus, but it is certainly unlikely that it is what the physician based their reasoning on.
AC D on the other hand establishes the necessary condition that success is only possible if an uncontrollable circumstance is favorable. In this question, the uncontrollable circumstance is whether the patient has disease X or Y. We cannot possibly know which disease the patient is infected with. We also know that disease Y is the only disease that has an effective treatment. So, if success is ONLY possible if we assume the patient has disease Y (the more favorable circumstance), then the physician should prescribe the treatment for disease Y.
AC E is another tricky one because it sounds very similar to the correct AC D and it is conveniently located as the last resort trap answer E. AC E is incorrect because it says that when only one strategy can be successful, the circumstances must be changed. If this was applied to the physician's reasoning, instead of prescribing treatment for disease Y, we would be doing everything possible to ensure the patient has disease Y. For instance, if the patient actually has disease X, under the principle in AC E, instead of prescribing the treatment for disease Y, we would first infect the patient with disease Y.