Question

which physical feature made trade difficult with lands north of china?
the gobi desert
the plateau of tibet
the north china plain
the himalayas

Explanation:

The Gobi Desert is located north of China. Deserts are harsh environments with extreme temperatures, lack of water, and difficult terrain, which would impede trade. The Plateau of Tibet is in the southwest. The North China Plain is a flat, fertile area that would facilitate movement rather than hinder trade. The Himalayas are to the south - west of China.

Answer:

the Gobi desert