The cogent argument was so ______ that almost everyone agreed. Which word completes the sentence?

• A. Cogent
• B. Weak
• C. Vague
• D. Irrational

Answer: (A)

The thing being tested is how degree expressions like “so … that” work with a quality like persuasiveness. Cogent means clear, logical, and convincing. The sentence already points to a highly persuasive argument, so the word that best completes the blank is the same quality in a stronger form. Saying “The cogent argument was so cogent that almost everyone agreed” reinforces just how convincing it was, which fits the idea of widespread agreement.

The other options don’t fit because they undermine the idea of broad agreement: a weak argument wouldn’t lead most people to agree; a vague argument lacks clarity and would not persuade; an irrational argument would not be expected to earn consensus.