Lindsey: Several people claim that our company was unfair when it failed to give bonuses to the staff. Perhaps they recalled that the company had promised that if it increased its profits over last year's, the staff would all get bonuses. However, the company's profit was much smaller this year than it was last year. Clearly, then, the company acted fairly.
The argument is flawed in that itLindsey shows that one possible reason for calling the company unfair is wrong: the company promised bonuses only if profits increased, but profits decreased.
The flaw is that this removes only
one possible reason for the unfairness claim; it does not prove that the company acted fairly overall.
(A) relies on the opinions of certain unnamed people without establishing that those people were well informed on the matter
This is not the flaw. Lindsey is not relying on those people’s opinions; she is rejecting their claim.
(B) infers that an opinion is false merely because one potential reason for that opinion has been undermined
This is correct. Lindsey weakens one possible basis for saying the company was unfair, but there could be other reasons the failure to give bonuses was unfair.
(C) dismisses a claim on the basis of certain irrelevant attributes of the people who made the claim
This is not happening. Lindsey does not attack the people who made the claim.
(D) confuses the size of a quantity with the amount by which that quantity has increased
This is incorrect. Lindsey says this year’s profit was smaller than last year’s, so profits did not increase. There is no confusion between size and increase.
(E) overlooks the possibility that a policy can be fair even when it is not generous
This is not the flaw. Lindsey’s conclusion is that the company acted fairly, so this choice supports her general direction rather than criticizing it.
Answer: (B)