Answer:
c. It has fertile soil.
Step-by-step explanation:
The northeastern plain of china stretches across the historic region of Manchuria. It is a very fertile area with a humid climate, which has contributed to the implementation of many agricultural crops, and agriculture is one of the main economic sectors of this region.
In recent years, the Chinese government has prioritized agriculture in its work, increased investment in the sector, increased peasant income to achieve the harmonious development of rural and urban areas, so the northeast region has been stimulated, contributing to its progress.