‘R’ will be the first part of the given sequence as it is talking about the limitations of Aristotle, that is, equipment he used for his work (ruler and compass and some crude instruments). ‘P’ will come next as now it makes a reference to the physical events. ‘Q’ will come next as now this part makes a reference to the industrial intervention in Greece. ‘S will pair with S6 because ‘S’ talks about the discovery of modern theories of Science and S6 talks of the fact that it was not an age of experiment which is linked with the concept of discovery. Hence, RPQS is the right sequence. Thus, option (a) is correct.