Which of the following statements about a paragraph's concluding sentence is true?

The correct answer is B: 'It summarizes the paragraph's main point.' The concluding sentence of a paragraph typically restates the main idea or central theme of that paragraph. It serves to bring closure and reinforce the key points discussed in the paragraph, providing a sense of completion to the reader. While the topic sentence introduces the main idea of the paragraph, the concluding sentence ties everything together by summarizing what has been discussed within the paragraph itself, not necessarily the entire essay. Therefore, option B is the most accurate description of the function of a paragraph's concluding sentence.