B. In the yellow and Yangtze River valleys
The Shang ruled in the Yellow River valley, which is commonly held to be the cradle of Chinese civilization. However, Neolithic civilizations originated at various cultural centers along both the Yellow River and Yangtze River. These Yellow River and Yangtze civilizations arose millennia before the Shang.
I am about 90% sure that the answer is B: In the Yellow and Yangtze River Valleys. I studied this topic last year.
