’S’ will be the first part of the given sequence as it contains the verb, that is, ‘adopted’. ‘Q’ and ‘R’ will follow logically as they contain the object on which the action is being taken. ‘P’ will come at the end as it begins with the reflexive pronoun, ‘who’ and refers back to the main subject of the sentence. Hence, SQRP is the correct sequence. Thus, option (a) is correct.