Where did the shang dynasty first develop?
a. by the heng shan mountains
b. near china's southern plains
c. around the yellow river
d. close to the island of hong kong

The Shang dynasty (Chinese: 商朝; pinyin: Shāng cháo) or Yin dynasty (Chinese: 殷代; pinyin: Yīn dài), according to traditional historiography, ruled in the Yellow River valley in the second millennium BC, succeeding the Xia dynasty and followed by the Zhou dynasty.
The answer is C.

4.a depression is the answer