I think the correct answer from the choices listed above is option A. The Northeast Plain is important to East Asia because it is an alluvial plain. This alluvial plain, fed by the Yellow and Yangtze Rivers, is one of the most heavily populated regions of China. Hope this answers the question.
Why is the Northeast Plain important to East Asia? A. It is an alluvial plain. B. It has fertile black soil that is important for farming. C. It serves as a boundary between China and India. D. It contains one of the world’s most populated areas.