I am not an expert. However I am sharing my Strategy.
Reading strategy for all Passage:
1. Find the main idea/or purpose : Why the author is writing this?
2. How does each para support the purpose?
Biology/Physical science Passage: Read quickly what is the point of passage, Note the point of each para so that u can refer back easily.
For all type of RC question except the LEAST/EXCEPT types i use the same strategy
1. Prethink the answer choice from my own comprehension. (Without looking at options - they may distract you)
2. Eliminate all answer choice based on off topic, partially correct, out of scope, reverse relationship, unnecessary assumptions, exaggerate options etc....
3. If bogged down in 2 choice (refer back to the related content and eliminate the wrong one)
For Main idea: You have to ask yourself why author is writing this. Please pause a few seconds to comprehend a small para and ask this question. Paraphase one para in single line. Then try to connect structurally how the author has connected the details with the main point. Dont bogged down in too scientific details, just get the gist.
After reading the whole passage take 20-30 sec and answer few questions.
1. What is the pain point or purpose of this writing.
2. How each para support the main point.
3. What is the inference of this Passage.
For this particular question the Key thing was last line of 2nd para where it tells scientists were inconclusive on the result.
Then go on answering the question, but cover up the choices and answer urself first and then try to find the answer choices according to your prethinking.
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Debrief 610-540-580-710(Long Journey): from-600-540-580-710-finally-achieved-in-4th-attempt-142456.html