Which best shows that the author's purpose is to explain how to tune a guitar?

The author claims that the string at the top is thickest.

The author outlines the steps that readers should take to tune a guitar.

Well, if the author claims that the string at the top is thickest, they might be widely off tune themselves! But if the author outlines the steps to tune a guitar, then it's safe to say their purpose is to explain how to do just that. Don't worry, I won't try to tune your guitar for you - you wouldn't want to subject your ears to my musical talents!

The second statement, "The author outlines the steps that readers should take to tune a guitar," best shows that the author's purpose is to explain how to tune a guitar.

The option that best shows that the author's purpose is to explain how to tune a guitar is "The author outlines the steps that readers should take to tune a guitar." This is because when an author provides a step-by-step guide, it indicates that their purpose is to explain a process or procedure, in this case, tuning a guitar. By outlining the steps, the author is demonstrating a clear intent to provide instructions and guide the reader through the process.