Why were chinese leaders concerned about u. n. forces invading north korea?

The options of the question are, A) They thought this may cause a war with Russia. B) they believed the enemy would invade them next. C) North Korea was a long time ally of Red Cina. D) Their nation was not prepared to carry on war.

The correct answer is B) they believed the enemy would invade them next.

The Chinese leaders were concern about United Nation forces invading North Korea because they believed the enemy would invade them next.

The decision of the United Nations Security Council on June 27, 1950, was to send the military to repel Nort Korea’s invasion of South Korea. The invasion started two days before the UN’s decision. The United States proposed the use of the Army and the Council approved it. When this happened, the Chinese leaders were concern about United Nation forces invading North Korea because they believed the enemy would invade them next.

i dont no the claim so it's hard to answer but i think he would go to the people to decide. : ) ; )