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(b); If option B is true, that is, if facts are relative and subject to interpretation, then that strengthens the passage's claim that facts do not speak for themselves. So, option B is the right answer choice.
The passage claims that facts do not speak for themselves by arguing that while facts are objective and universal and hold true irrespective of the historian who expresses it, it is the historian who decides to which facts to give the floor, and in what order or context, thereby influencing their interpretation. So, all options except B, if true, weaken the passage's claim.