​Directions: Each of the following items in this section consists of a sentence, parts of which have been jumbled. These parts have been labelled as P, Q, R and S. Given below each sentence are four sequences, namely (a), (b), (c) and (d). You are required to rearrange the jumbled parts of the sentence and mark your response accordingly.

speed is a potent cause (P)/ industrial growth at a terrific (Q)/ in a big city (R)/ of pollution (S)