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This boldface question tests our ability to identify argument structure and how different parts function within the columnist's reasoning. Let me break this down systematically.

Solution Approach:

Step 1: Map the Argument Structure
First, let's identify what's happening in the passage:

Historians reject conspiracy theories as explanations for historical events
Their reasoning (Boldface 1): Large, complex conspiracies can't stay secret for years

Columnist's response: "Yet to argue in this way is a mistake"
Columnist's counter (Boldface 2): Conspiracies can be simple - just two decision-makers with a secret motive

Step 2: Identify the Columnist's Position
The columnist disagrees with historians. The key phrase "Yet to argue in this way is a mistake" signals the columnist is challenging the historians' reasoning. The columnist's main conclusion is that historians are wrong to reject conspiracy theories based on their assumption about conspiracy complexity.

Step 3: Analyze Boldface Functions
Boldface 1: "it is quite unlikely that complex arrangements involving large numbers of conspirators would be kept secret for years"

  • This is the reasoning historians use to support their rejection of conspiracy theories
  • It's a premise in the historians' argument, NOT their conclusion
  • The columnist opposes this reasoning

Boldface 2: "it need involve nothing more than two top decision makers sharing an ulterior motive and keeping it secret"

  • This supports the columnist's counter-argument
  • It's evidence for why the historians' approach is flawed
  • Shows how conspiracies could actually work effectively

Step 4: Evaluate Answer Choices

Let's quickly eliminate wrong answers:

A & B: Both incorrectly identify the first boldface as a "conclusion" - it's actually the reasoning/premise historians use
C: Says the columnist believes the first premise supports something - but the columnist actually disagrees with using this premise
E: Claims the second boldface better supports the historians' conclusion - but it actually opposes their view entirely
D: ✓ Correct!

First part: "premise the columnist contends is mistakenly used" - Yes, historians use this premise incorrectly
Second part: "premise given to support the columnist's contention" - Yes, it supports the columnist's argument that historians are wrong

Answer: D

Want to master the complete framework for solving ALL boldface questions systematically? Check out the detailed solution on Neuron by e-GMAT, which includes visualization techniques, alternative approaches, and the universal pattern that applies to similar GMAT problems. You can also explore comprehensive solutions for Official questions here.

The full Neuron solution reveals advanced strategies for quickly identifying argument structure and avoiding the common premise-conclusion confusion trap that catches most test-takers on boldface questions.
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Main idea:
Many historians think that historical events are not explained by conspiracies because it's hard to keep complex arrangements a secret by the sheer number of conspirators required. However, they are mistaken because the conspiracy may not need to be large or complex to be executed which thus is easier to keep secret.
So the first boldface provides the reasoning used by people who oppose the main argument. The second boldface explains why the main claim is correct.
The difference between D and E's first parts is that D says sentence 1 is an incorrect reasoning used to support the disagree-ers and E says sentence 1 is merely a hypothesis the columnist thinks is used to support the disagree-ers. (The usage of because suggests certainty and more alignment with used in D)

And the second part of D is correct because sentence 2 is not a conclusion but evidence to support the columnist's argument
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