Correct option 2) The error lies in the second-part. [ alt="428 (1)" src="//storage.googleapis.com/tb-img/production/20/09/428%20%281%29.png" style="width: 48px; height: 48px;">Explanation: It should be ‘latter’ instead of ‘later’. ‘Latter’ means occurring or situated nearer to the end of something than to the beginning. When two people, things, or groups have just been mentioned, we can refer to the second of them as the latter. ​Example: He tracked down his cousin and uncle. The latter was sick. (latter, here, refers to the uncle) ​Here, ‘latter’ refers to Kerala Munnoka Samudaya Aikya Mnunnani. ‘Later’ is the comparative adjective of late which means after the expected, proper, or usual time. Examples: He arrived later than usual. He was late on that day. Hence, the correct sentence will be, - Several petitioners, including Janhit Abhiyan and Kerala Munnoka Samudaya Aikya Mnunnani, the latter represented by advocate V.K. Biju, have challenged the validity of the Constitutional Amendment.