OPTION 4 i.e." RQPS"In this ARRANGEMENT, the first and last sentences are already fixed.Sentence 'R' STARTS with the connector 'Firstly' and Sentence 'P' starts with connector 'Further' which MAKES them second and third sentence respectively in the NEW arrangement.'Most important of all' is the connector generally used for the last points which make the sentence 'S', the fifth sentence.Now we are left with the sentence 'P' to be the fourth sentence of a new arrangement.Hence, from above explanation, the new arrangement will be: - "1RQPS6"