The statement
P : therefore you must listen carefully
Q : what the speaker has said
R : in order to understand
S : will be made just once

The Proper sequence should be:

A. RSPQ

B. SPQR

C. SPRQ

D. SRQP

Answer: Option C

Solution(By Examveda Team)

The statement will be made just once therefore you must listen carefully in order to understand what the speaker has said.