Which sentence best supports the main idea?

• A. The sentence that links to the thesis
• B. The sentence that repeats the main point
• C. The sentence that directly links to the thesis
• D. The sentence that introduces a new topic

Answer: (C)

Understanding how a sentence supports the main idea relies on its direct connection to the thesis. The best choice is the sentence that directly links to the thesis because it makes the relationship explicit—showing exactly how the details reinforce the central claim. In solid writing, supporting sentences should tie back to the main idea, offering evidence, explanation, or analysis that clearly connects to the thesis. A sentence that merely links to the thesis without a clear tie-back can feel loose or tangential, while restating the main point doesn’t add new support, and introducing a new topic shifts focus away from the central idea. So the strongest option is the one that directly ties to the thesis, reinforcing the main argument with clear, explicit connection.