The man
P : is generally the one
Q : who can work very hard
R : when he must work
S : who can play most heartily when he has the chance of playing

The Proper sequence should be:

A. PSQR

B. QRPS

C. QRSP

D. SPQR

Answer: Option B

Solution(By Examveda Team)

The man who can work very hard when he must work is generally the one who can play most heartily when he has the chance of playing.