What effect did the entrance of Chinese troops have on the Korean War?

Question

The entrance of China encouraged the Soviet Union to send in hundreds of thousands of troops on the North Korean side.
Successive Chinese victories demoralized American troops and led to mass desertions.
It initially turned the tide of the war against UN and American forces, eventually leading to a stalemate.
It provided a decisive victory for the Communist side that led to the spread of Communism on the whole peninsula.
help plz

Answer 1

its c

Answer 2

yes, it is c.