They felt safer
P : to watch the mountain
Q : of more than five miles
R : as they settled down
S : from a distance

The Proper sequence should be:

A. RPSQ

B. RSQP

C. PQSR

D. PRSQ

Answer: Option A

Solution(By Examveda Team)

They felt safer as they settled down to watch the mountain from a distance of more than five miles.