Direction: In each of the following questions, rearrange the parts P, Q, R and S to make a proper sentence. \[\text{The majority of}\frac{\text{Britons believe that there}}{P}\] \[\frac{\text{if the}}{{}}\] \[\frac{\text{increasing problem}}{Q}\] \[\frac{\text{must be restrictions on}}{R}\] \[\frac{\text{cheap air travel}}{{}}\] \[\frac{\text{of global warming is going to be}}{S}\] \[\frac{\text{tackeled}}{{}}\] Which one of the following sequences is correct?