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Answer: 4. They make inferences
Explanation: 1 isn't correct because you should not ignore the evidence. 2 is wrong because it would A) take too long to get back B) it's just not the easiest way and C) the author probably does not have time to answer that. And 3 is wrong because rereading if you do not make any inferences does not get you anywhere.
I hope this helps :)