What is the most likely explanation for why the shang had little interaction with non-chinese cultures?

1)they were unable to travel upon the yellow river.
2)they were surrounded by higher plains and mountains to the north and west.
3)they were not aware of the other cultures existing nearby.
4)they were unable to use the seas to establish trade with others due to lack of technology.

The correct option is 2

The Shang Dynasty is the second dynasty in the history of China and the first whose historical existence is documented. Its territorial extension included the valley of the Yellow river. The territory of the Shang extended in the North half of the present province of Henan and the half southern of Hebei, the western part of Shandong, the zone more to the north of Anhui and the northwest of Jiangsu. In this territory the population was organized in units called zu, occupying a generally walled city in which the most common was that only members of the clan lived.

when a country suffers, for example, a drought period, the market product is affected for a low offer, in this case, potatoes; the government has to tax to the households, which have to give more money for the potatoes which they consume, that situation make them consume substitute goods even through loans, it could increase the financial market movement and the inflationary phenomena, the business has to increase salaries in order to the employees could buy a more expensive food (potatoes) and in order to inflation tha business had to buy expensive supplies in the factor market, while the rest of the world have to gain more money to consume the same amount of potatoes.

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