I enclose
P : and the postage
Q : a postal order
R : the price of books
S : which will cover

The Proper sequence should be:

A. RPSQ

B. QSPR

C. QSRP

D. QPSR

Answer: Option C

Solution(By Examveda Team)

I enclose a postal order which will cover the price of books and the postage.