B. <u>"a collection of tribes who began crossing the Hindu Kush into India in 1500 BCE"</u>
The Zhou created the Mandate of Heaven: the idea that there could be only one legitimate ruler of China at a time, and that this ruler had the blessing of the gods. They used this Mandate to justify their overthrow of the Shang, and their subsequent rule.
<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be that the population is "getting younger", since birthrates are higher and healthcare is better.</span></span>
