S1: I took cigarettes from my case.
P : But when the fit of coughing was over, he replaced it between his lips.
Q : I lit one of them and placed it between the lips.
R : Then with a feeble hand he removed the cigarette.
S : Slowly he took a pull at it and coughed violently.
S6: Then he continues to draw on it.
The Proper sequence should be:

A.
PSQR
B.
QPSR
C.
QSRP
D.
SRPQ