The policeman
P : to return the lady's purse
Q : asked him
R : who had caught a pick-pocket
S : if he wished to avoid imprisonment

The proper sequence should be:

A. PSQR

B. QRPS

C. RQPS

D. SQRP

Answer: Option C

Solution(By Examveda Team)

The policeman who had caught a pick-pocket asked him to return the lady's purse if he wished to avoid imprisonment.