‘S’ will be the first part of the given sequence as per the subjectverb agreement rule, that is,‘Kuala Lumpur is’. P will come next as the relative pronoun ‘where’ is used in the context of ‘city’ mentioned in previous part. R will come next as ‘cellular phone in hand’ is used in the context of ‘executives’ Q will obviously be the last part of the given sequence. Hence, SPRQ is the right sequence. Thus, option (b) is correct.