Each of the following items in this section consists of a sentence, parts of which have been jumbled. These parts have been labeled as P, Q, R, and S. Given below each sentence are 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.

As human activity destroys biodiversity (P)/  at unprecedented rates, countries from (Q)/ around the world are meeting at COP15 in Montreal(R)/ to negotiate a path towards protecting our natural world. (S)/