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 has four sequences, namely (a), (b), (c) and (d). You are required to re-arrange the jumbled parts of the sentence and mark your response accordingly.

carbon dioxide and methane (P)/ increase in temperature of earth's surface (Q)/ due to green house gases like (R)/ global warming is the phenomenon of (S)