So do you go back those "hard" sentences to answer infer questions? Sometimes there are a couple of infer questions...do you go back to the same place?
@Q.E.D
But sometimes the question stem only says "what can infer from the passage" and in this case there is no indication where to look back...
in this case do we get clue from answer choices?
... world**, then you could also infer B (Most)--> A, represented ... , we most certainly CAN NOT infer that B(Most)--> A ... Bs is unknown, we cannot infer B(Most)--> A solely ...