Question

Why did the conflict in Korea escalate?

a. North Korea invaded South Korea.
b. The U.N. became involved in the conflict in an attempt to stop war.
c. The United States sent in troops and medical units to support South Korea.
d. It escalated for all of the above reasons.

Answer 1

It escalated when North Korea Invaded South Korea, When the UN became involved in the conflict to stop war, and also when the US sent in troops and medical units to support South Korea.

So, D