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:

Answer: Option D

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.