(B) The argument states that there can be no compensation for "all the wrongs in history," but the argument is about just one wrong of history. Even though all wrongs cannot be compensated for, some wrongs can be.
(D) Answers A and C are incorrect because they are simply not supported by the facts stated in the passage. Answer B is not necessarily true because the passage compares wages in terms of percentage increases, not actual wages. Answer D is almost identical to the second sentence in the passage, and is correct.