‘P’ will be the first part of the given sequence as it introduces the first lesson of discipline which is referred in S1 (sense of discipline). R will come next as the transition word ‘then’ shows that it is making a further reference to something after reflecting the ‘first discipline’. ‘S’ will be the next part because it is talking about bringing the equanimity in the life of people. ‘Q’ will definitely pair with ‘S6’. Hence, PRSQ is the right sequence. Thus, option (d) is correct.