The U.S. soyabean
P : in the developing world
Q : and when famine strikes
R : is America's singlemost lucrative export
S : American soyabeans are a major source of high protein sustenance

The Proper sequence should be:

A. PRSQ

B. PSRQ

C. RQPS

D. RQSP

Answer: Option D

Solution(By Examveda Team)

The U.S. soyabean is America's singlemost lucrative export and when famine strikes American soyabeans are a major source of high protein sustenance in the developing world.