Historian: The revolutionary party has been accused of having many overambitious goals and of having caused great suffering. However, most of the party's goals were quickly achieved and the party did not have enough power to cause the suffering the critics claim it caused. So it is clear that the party was not overambitious and caused no suffering.
The reasoning in the historian's argument is flawed because the argumentThe historian tries to answer two criticisms. The evidence may weaken the claim that the party caused great suffering, but it does not prove that the party caused
no suffering at all. That is the key overreach.
(A) gives mutually inconsistent responses to the two criticisms
The responses are not inconsistent. The historian says the goals were mostly achieved and the party lacked enough power to cause the claimed suffering. Those two points can both be true.
(B) fails to establish that the revolutionary party caused no suffering
This is correct. Showing that the party could not have caused the amount of suffering critics claim does not show that it caused
no suffering. It may have caused some suffering, just not as much as critics said.
(C) fails to establish that any of the revolutionary party's critics underestimated the party's power
This is not the issue. The argument does not need to prove that critics underestimated the party’s power; it claims that the party lacked enough power to cause the suffering alleged.
(D) provides no evidence that the revolutionary party's goals were not overambitious
This is too strong. The fact that most goals were quickly achieved is at least some evidence that the goals were not overambitious.
(E) fails to consider other major criticisms of the revolutionary party
Other criticisms are irrelevant. The argument is only about these two criticisms.
Answer: (B)