B. understandable. It is crucial for writers to ensure that their writing is clear, coherent, and easily comprehensible to their intended audience. Writing that is confusing or convoluted can hinder effective communication and may fail to convey the intended message. By using clear language, organizing thoughts logically, and providing sufficient context, writers can make their work more understandable and engaging for readers. While positivity and knowledge are important, without understandability, the message may not effectively reach the reader.