What caused china to enter the korean war

Was a counter attack.  The PRC issued warnings that the Allied forces should keep their distance, and beginning in October 1950 troops from the Chinese People's Liberation Army began to cross the border to assist their North Korean ally. Their numbers grew to around 300,000 by early November.

China entered the Korean war because China didn’t feel safe with the situation back then.

yes

it is because 3 because the citizen the northern democratic party watned the warning on red to blue because it is purple. lol