Choose the most logical order of sentences from among the given choices to construct a coherent paragraph:(a) Parts of northern region were pounded by heavy rains today, (b) Vehicular traffic came to a near halt. (c) As mid and high altitude areas of Himachal Pradesh were in grip of severe cold wave with snow lashing the tribal areas and mid ranges receiving showers. (d) As the sky remained heavily overcast with dark clouds reducing the visibility considerably. (e) A large number of tourists were forced to buy heavy woollens and stay indoors due to inclement weather.

Different words form a sentence and convey their meaning only when arranged in a proper order. A Paragraph is formed from sentences, it will convey its true meaning and purpose only when the sentences are arranged in a proper manner.    
In the following questions, some parts of the sentence have been jumbled up. You are required to rearrange these parts which are labelled P, Q, R and S to produce the correct sentence.