Final answer:
The flooding mentioned in the question is estimated to have killed nearly 4 million people in 1931. The Yellow River is Asia's second-longest river and has been prone to significant flooding throughout history.
Step-by-step explanation:
The correct answer is Yellow River (b).
The flooding mentioned in the question is estimated to have killed nearly 4 million people in 1931. However, it is important to note that flooding has been a recurring issue in both the Yangtze River and Yellow River throughout history.
The Yellow River, also known as the Huang He, is Asia's second-longest river and has been prone to significant flooding. The river's water flow from the Tibetan Plateau, combined with its high silt load, has made it difficult to control and has caused deadly deluges in China. The river's floods have been paired with periodic droughts due to limited rainfall in the region.