What is the best way to determine the main idea in a passage?

• A. The last sentence
• B. The longest sentence
• C. The sentence that directly links to the thesis
• D. The sentence with the most adjectives

Answer: (C)

The main idea is most reliably identified by the sentence that directly links to the thesis. That sentence states the central claim or clearly shows how the details support the overall argument, acting like a thread that ties the whole passage together. When you spot this linking sentence, you’ve found the anchor for what the author is trying to prove or explain, which is exactly what the main idea is.

The other options aren’t dependable signs: the last sentence may wrap up the piece but doesn’t always restate the main idea, the longest sentence isn’t a reliable cue for the central point, and the sentence with the most adjectives is focused on description rather than on conveying the passage’s core claim.