This is a very difficult question, I fell for the trap of selecting AC (B) although I initially selected AC (C). After 20 minutes, I can finally explain why answer choice (C) is correct as opposed to answer choice (B). If you read the first sentence of the stimulus carefully, it states that the scientists failed to find any correlation whatsoever between pain intensity and features of the weather. This means there is no evidence to indicate there is any relationship at all between arthritic pain intensity and weather conditions. (B) states that the sufferers beliefs about the causes of pain may affect their pain intensity - this is a very clever trap answer but it is not correct, it isn't supported by the evidence that there is no correlation between pain intensity and the weather. Furthermore, (B) simply states sufferer's beliefs about causes can affect the intensity of the pain - this answer choice is implying that there's a subtle relationship between belief and pain intensity, an assumption that is beyond the scope of the argument and something which isn't as strongly supported in MSS question.

(C) is clearly supported and is an inference forced out from the stimulus; it is also simpler than answer choice (B): it states there is no correlation between the weather conditions and the pain intensity and that there is no relationship between the two phenomena hence why it is imagined by pain sufferers as being connected to one another that the stimulus provides slightly more evidence for.

If you feel burned out, I recommend taking a break and really re-evaluating your approach on studying. Are you spending enough time reviewing your mistakes? Are you doing too many practice sections or practice tests? What are your weak sections? Are their particular question-types you are struggling with? What is your diet and sleep habits like? All of the answers to these questions are relevant as they are what can really allow you lock back into your studying with laser focus and allow you to overcome the plateau/fence that you're struggling against.

Keep in mind, this is also a difficult exam with a significant amount of remarkably intelligent people seeking to score at least above the 80th percentile (160+) - so it's really important to maintain an attitude based in mindfulness and humility. I started off at a 144 diagnostic and I'm now PTing at the mid 160s - one thing that I've learned for certain is that whenever I have experienced a plateau in my studying, it means that my attitude and my approach to evaluating problems and mistakes have been wrong - it helps to reach out to a tutor or another high-scoring test-taker for their input. However, externalizing your doubts and referring to an expert(s) as you are is one step, the next step is resilience and hard-work to follow-through on their feedback/guidance.

Remember, you can do this.

I would recommend Manhattan Prep's book on Reading Comprehension - it's very helpful, it teaches you methods that are complementary to JY's low-resolution memory method.

I'm interested as well!