Final answer:
The blue box in a diagram planning an essay represents the body of the essay. The correct answer is option B.
Step-by-step explanation:
When a diagram is used to plan an essay, the blue box typically represents the body of the essay. The body is where you flesh out your main arguments or points that support your thesis statement. It serves as the foundation of your essay's argument, much like the walls of a house, with each paragraph within the body serving to strengthen the overall structure of your writing.
The introductory paragraph, often represented by an upper triangle in diagrams, serves as the doorway to the essay, presenting the thesis and the framework for what will follow. Similarly, the concluding paragraph, possibly symbolized by a lower triangle, functions like a roof that secures everything underneath it, reiterating the thesis and main points to provide a strong finish.
Within the body itself, each key point should be supported by facts, analysis, and evidence, ensuring that the reader is persuaded of the essay's central argument. Using a clear organizational structure, with a solid introduction, well-explained body paragraphs, and an impactful conclusion, leads to effective expository writing.