The body of water in China's northeastern plains that supports the cultivation of wheat is the c. Yangtze River.
The Yangtze River is very important to the agricultural industry in China as it supports the growth of a lot of crops.
One such crop is wheat. The water and nutrients provided by the Yangtze River allow for China to be one of the largest exporters of wheat in the world.
Find out more on the Yangtze River at https://brainly.com/question/988726.