‘S’ will be the first part of the given sequence as it is in continuation with the previous statement and talks about what the speaker noticed while completing the action in the previous statement. ‘R’ will follow next as it refers back to the previous statement which is clearly indicated form the word, ‘What delighted me the most’. ‘P’ will follow next as it is in continuation with the previous statements and describes the subject in ‘R’. ‘Q’ will come next as it completes the meaning and tells us about the reaction of the action mentioned in the previous statement. Hence, SRPQ is the correct sequence. Thus, option (a) is correct.