In a paragraph, what is the function of a topic sentence?

• A. To Provide Background Information
• B. To State the Main Idea of the Paragraph
• C. To Conclude the Paragraph
• D. To Present Supporting Details

Answer: (B)

The function of a topic sentence is to state the main idea of the paragraph. It signals to the reader what the paragraph is about and sets the direction for everything that follows. When the main idea is clearly presented at the start, the rest of the sentences provide details, examples, or reasons that support that idea, creating a sense of unity throughout the paragraph. Often the topic sentence appears as the opening line, though some writers place it later or imply it; the essential point is that all subsequent sentences tie back to that central idea. Background information tends to provide context, conclusions wrap things up, and the details seated in the body of the paragraph are the evidence or elaboration that develops the main idea.