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Question

Difficulty: HardCircular Reasoning (Begging the Question)

Historian: The newly discovered manuscript claiming to be the lost journal of Emperor Valerian is clearly a modern forgery. The text makes numerous references to complex military tactics that were completely unknown during Valerian's era. We can be certain that these tactical descriptions do not reflect actual historical events of the time, because they appear in a manuscript that is decidedly not genuine.

Which one of the following most accurately describes a flaw in the historian's reasoning?

  1. A
    It takes a condition that is sufficient to prove a document is forged to be a condition necessary for the document to be forged.
  2. It supports a premise of the argument by taking for granted the truth of the argument's main conclusion.Answer
  3. C
    It allows the meaning of a key concept regarding authenticity to shift subtly between the premises and the conclusion.
  4. D
    It confuses an intermediate conclusion regarding historical military tactics with the argument's overall main conclusion.
  5. E
    It treats general background context about historical eras as if it were an active premise proving the claim.

Answer

The argument supports a premise of the argument by taking for granted the truth of the argument's main conclusion.
The argument exhibits circular reasoning, also known as begging the question. The historian's main conclusion is that the manuscript is a forgery. To prove this, the historian claims the military tactics described in it are historically inaccurate. However, when providing evidence for *why* the tactics are historically inaccurate, the historian states it is 'because they appear in a manuscript that is decidedly not genuine.' Thus, the historian uses the conclusion to prove a premise, which is in turn used to prove the conclusion. The correct option perfectly describes this structural loop.

Step-by-Step Solution

1
Identify the main conclusion of the argument.
The main conclusion is: 'The newly discovered manuscript claiming to be the lost journal of Emperor Valerian is clearly a modern forgery.'
This is the primary claim the historian is attempting to establish.
2
Identify the premises provided to support the conclusion.
Premise 1: The text references military tactics unknown in that era. Premise 2: These tactical descriptions do not reflect actual historical events *because* the manuscript is not genuine.
Deconstructing the argument reveals how the author attempts to prove the main claim.
3
Analyze the logical relationship between the premises and the conclusion to find the flaw.
The historian uses the claim that 'the manuscript is decidedly not genuine' (which is the main conclusion) as the sole evidence to prove that the tactical descriptions are inaccurate. They then use the inaccuracy of the descriptions to prove the manuscript is a forgery.
Evaluating the flow of logic reveals a closed loop where the conclusion is used to prove the premise that proves the conclusion.
4
Select the option that matches this structural flaw.
The correct option describes the argument as supporting a premise by taking the conclusion for granted.
This is the formal description of circular reasoning (begging the question) present in the stimulus.

Key Concept

Circular Reasoning (Begging the Question)
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Topics

Circular Reasoning (Begging the Question)

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