The word Trivial describes something of little value or importance, insignificant, or trifling. It refers to matters that are not serious or consequential. Therefore, the most fitting synonym among the given options is Minor (option B).
When something is trivial, it means it's small, unimportant, or easily dismissed. For instance, “trivial concerns” are those that don't warrant much attention, and a “trivial detail” is one that doesn't significantly impact the overall picture. Option A, “Important,” is an antonym, signifying great value or significance. Option C, “Major,” also implies importance or a larger scale, making it an antonym. Option D, “Serious,” suggests gravity or earnestness, which is contrary to the meaning of trivial. Recognizing “trivial” helps in distinguishing between significant issues and those that are inconsequential, allowing for better prioritization and focus in various contexts.