Which BEST explains how the Gobi Desert hinders trade?

A
There is a severe lack of drinkable water to be found in the large expanse of the Gobi Desert.

B
The nomadic herders have allowed their goats to overgraze the grasslands of the Gobi Desert.

C
The Gobi Desert is home to many wild animals, such as snow leopards, brown bears, gazelles, and wolves.

D
The Gobi Desert has a rocky, hard-packed terrain which is better for travel than the shifting sand dunes found in some other desert environments.

A

There is a severe lack of drinkable water to be found in the large expanse of the Gobi Desert.