I’m pretty sure it is D because A, B, and C all are pretty accurate numbers to the exact number who fought in the civil war
I believe the answer to this question is to stop the spread of Communism. If South Korea was taken by China and North Korea, the "Dominoes" might start falling and other countries might want to become Communist. Great Britain, the USA, Australia, and other counties lend their support to stop this communist spread.
Answer: c low temp luminosity
Explanation: