The dull are likely to have a limited conceptual grasp.
It is unlikely that the dull would have adequate conceptual grasp.
The dull are not likely to grasp concepts easily.
It is unlikely that the dull can grasp concepts easily.
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The Correct Option isC
Solution and Explanation
The idea is that people described as “dull” have difficulty understanding concepts.
Option (A) is correct in meaning but uses a more abstract phrase “limited conceptual grasp” which is less direct and less conversational than “not likely to grasp concepts easily.”
Option (B) and (D) use an “It is unlikely that…” structure, which is longer and adds extra words without improving clarity.
Option (C) is the most straightforward: “The dull are not likely to grasp concepts easily” conveys the meaning clearly, avoids abstraction, and uses plain words.
It is both concise and direct, making it the best choice.