OPTION 2.The MEANING of the given word 'SUBSIDE' is 'to become calmer, QUIETER or less intense'.Out of given alternatives, the word 'enlarge' is the antonym of the given word as it means 'to MAKE something bigger; to become bigger'.The meaning of other words:diminish: to make something smaller.ease: make (something UNPLEASANT or intense) less serious or severe.abate: to become less intense or severe; to make something less intense or severe.