Concept:The correct sequence of parts forms a meaningful and grammatically correct sentence.Explanation:Start with R ("the discovery of petroleum") as it introduces the subject.Next, Q ("in the Middle East has changed") logically follows to specify where and what effect.Then, S ("the lifestyle of the people") completes the action of change.Finally, P ("across the world") adds the scope of the change.Thus the correct order is R, Q, S, P.Answer:Option D (RQSP) is the correct answer.