'Q' will be the first part of the sentence as it contains the subject and the verb, that is, 'He gave orders'. 'S' will be the next part as it contains the object on which the action takes place, that is, 'to his men'. 'R' and 'P' will follow logically as they complete the meaning of the sentence together and tells us what happens next. Hence, QSRP is the correct sequence. Thus, option (b) is correct.