Concept:Frivolous means something not serious, trivial, or lacking importance. Its synonym will share the idea of being unimportant or petty.Explanation:The word "Frivolous" describes things that are silly, not serious, or have little value. For example: She dismissed his frivolous complaints. Among the options, "Trivia" refers to unimportant details or facts of little worth. For example: The quiz had lots of trivia. Therefore, Frivolous and Trivia both convey the sense of lacking significance. The other options – Powerful (शक्तिशाली), Essential (आवश्यक), and Significant (महत्वपूर्ण) – all imply importance or strength, which are opposite in meaning.Answer:D. Trivia