Concept:The word "enhance" means to increase or improve the quality, value, or extent of something. Its antonym must convey the opposite idea—reducing or lessening.Explanation:Look at each option. "Increase", "Enlarge", and "Augment" all mean to make something larger or greater. They are synonyms of "enhance". "Diminish", however, means to make smaller, decrease, or reduce. This directly opposes the meaning of "enhance". For example, enhancing a skill improves it, while diminishing it weakens it. Therefore, "diminish" is the correct antonym.Answer:Option C (Diminish)