‘R’ will be the first part of the given sequence because it tells the consequences of Isaac’s mother remarriage, that is, he was left to the care of his good old grandmother. It will pair with ‘Q’ as the pronoun ‘she’ is used for ‘good old grandmother’. ‘S’ will come next as it states that how (in his early years) he was as a student in his school. ‘P’ will pair with S6 as ‘P’ talks bout he being clever in making things and S6 states the little tools and saw of various sizes created by him. Hence, RQSP is the right sequence. Thus, option (a) is correct.