Concept:Identifying the correct sequence by linking parts that form logical and grammatical connections.Explanation:The first part should introduce the main subject and verb.Part S begins with "economic progress is determined" – this is a natural opener.Part P adds the measure "in terms of GDP and GNP" – it logically follows S.Part R uses the relative clause "which are the two major determinants" – it connects to P to explain GDP and GNP.Part Q provides the purpose "for gauging the success of a nation" – it concludes the sentence.Thus, the correct order is S → P → R → Q.Answer:Option C: SPRQ