In writing, what is a thesis statement and what makes it effective?

• A. A concise claim that previews the main argument; it should be arguable and specific.
• B. A broad description of the topic.
• C. A conclusion drawn from the evidence.
• D. A long paragraph that lists sources.

Answer: (A)

A thesis statement is a concise claim that previews the main argument and expresses a clear position on the topic. It should be arguable and specific, so you can support it with evidence and reasoning.

This makes it effective because it gives the reader a roadmap for the essay: it tells what you’re arguing and what kind of evidence you’ll use, helping you stay focused and organized. A strong thesis also sets the scope and boundaries of the discussion, so the writing stays targeted rather than drifting to vague or unrelated points.

A broad description of the topic doesn’t take a stance or promise a specific argument, so it doesn’t provide the direction an essay needs. A conclusion drawn from the evidence is something you arrive at after presenting and analyzing information, not a guiding claim from the start. A long paragraph listing sources isn’t an argument at all; it lacks a central claim to defend.