Question

How did the Huang River civilization develop differently from other river valley civilizations? Its trade with India brought it goods as well as new ideas. Its mining industry allowed it to create iron weapons and tools. Its location limited its contact with other advanced cultures. Its armies helped it expand through conquest.

Answer 1

"Its location limited its contact with other advanced cultures" would be the best option from the list, since a system of boundaries made it inadvantageous for people to both come and go from the territory. 

Answer 2

Its location limited its contact with other advanced cultures.

The Huang River civilization was more advanced and progressive compared with the other contemporary civilizations in the world. Therefore, it was also known as "the precocious civilization"