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. You are required to re-arrange the jumbled parts of the sentence and mark your response accordingly.
high-altitude climbing /(P) in spite of the availability /(Q) is still a very dangerous task /(R) of oxygen masks /(S)
1
P R Q S
2
Q S R P
3
R S P Q
4
S Q R P