(P) world leaders are greatly concerned (Q) about the risk of nuclear war (R) since the relationship between (S) the two warring nations has touched rock bottom.

The correct sequence should be

Directions: In the following sentence, some parts of the sentence have been jumbled up. You are required to rearrange these parts which are labelled P, Q, R, S to produce the correct sentence. Choose the proper sequence and mark in your answer sheet accordingly.