‘S’ will be the first part of the given sequence as ‘mystery’ has been used in the context of ‘which baffles’ in the opening part. ‘P’ will come next as the contrasting word ‘but’ shows the contrast by making it clear that in spite of advancement in science, human beings have been curious to know about them. ‘R’ will further justify the acts of ‘curiosity’ which is in the form of attempting to click photographs. ‘Q’ will obviously be the last part that needs to be paired with S6. Hence, SPRQ is the right sequence. Thus, option (c) is correct.