Three specific rock-forming processes; i.e., the manner in which they formed.
China A is understood to be the richer part of China: typically it's the part of China that is the more developed and richer, and typically it's also the urban population. China B is the poorer, typically urban part of China.
The correct answer is:
"China A" is urban, more affluent and rapidly developing; "China B" is rural, poor and not developing.
Similar distinction is done in other countries too.
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Explanation:
Asia, Africa, North America, South America, Antarctica, Europe, Australia