`S_(1)` : A devastating earthquake had hit Mexico city.
`S_(6)` : The condition of 1000 others was reported unsafe.
P : Fifty more were later judged dangerously close to falling.
Q : The quake's force was measured at `7*8` on the Richter scale.
R : In four chaotic minutes, an estimated 250 buildings collapsed in downtown Mexico city.
S: It was the world's most severe quake since the quake in Chile last March.
The proper sequence should be

Options

A. SRPQ
B. QSRP
C. PQSR
D. RPQS