The word 'significant' means important or noteworthy. Therefore, 'important' is the closest synonym among the choices. * **Core Concept:** Understanding synonyms. * **Solution Analysis:** Choosing the word that means 'important'. * **Detailed Option Analysis:** * **A:** Incorrect. 'Minor' means small or unimportant. * **B:** Incorrect. 'Trivial' means unimportant or insignificant. * **C:** Correct. 'Important' is a synonym for 'significant'. * **D:** Incorrect. 'Insignificant' means not important or not worthy of attention. * **Common Mistakes:** Mistaking words with opposite meanings as synonyms.