According to Map 4.1, "The Geography of Historical China," the Neolithic settlements along which river may have experienced problems with flooding due to the increased probability of silt accumulation at the bottom of the river? 
Definitions:
Cardiovascular Risk
The likelihood or probability of experiencing heart-related health problems, influenced by factors like lifestyle and genetics.
Utilitarianism
An ethical theory proposing that the best action is the one that maximizes utility, generally defined as that which produces the greatest well-being of the greatest number of people.
Ethical Dilemma
A situation in which a difficult choice has to be made between two or more alternatives, especially ones that are equally undesirable but have moral implications.
Relevant Information
Data or details that are pertinent and useful to the matter at hand, helping in making informed decisions.
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