How did General MacArthur’s landing at Inch’on and successful push toward the Yalu River affect the course of the Korean War?

a. Observing MacArthur’s success, the Soviet Union and China sent guns and warplanes to aid North Korea.

b.Fearing an American invasion in China, Mao Zedong dispatched troops to support North Korea’s armies.

c.As U.S. forces advanced and winter set in, China supplied North Korean troops with food and ammunition.

d.As MacArthur’s troops neared China’s border, Mao Zedong asked the UN to help settle the Korean War.