The gobi desert spans across these two countries:

a.) china and mongolia
b.) mongolia and russia
c.) china and north korea
d.) north korea and south korea

The answer is I guess A. Mongolia and China

Gobi desert is the largest desert region in Asia. It is only fifth among the largest in the world. This covers most regions in northern and northwestern China and up into southern Mongolia. Thus, the answer to the question above is letter A. 

Brand c i think that should be it

Answergranulation;