Final answer:
Each paragraph in an essay should be unified and coherent as part of the larger work, supporting the overall thesis while being clear and complete on its own.
Step-by-step explanation:
Every paragraph within an essay should be able to stand on its own while maintaining unity and coherence, meaning the correct answer is B) It's part of a larger essay. Although each paragraph should support the overall thesis or main idea of the essay, it should also possess a clear topic, be connected through appropriate transitions, and include relevant evidence and details to provide a sense of completeness to the reader. A lack of coherence, repetition of information, or unrelated ideas would disrupt the flow and unity needed within an essay.