Answer:
D. The war ended in a stalemate.
Step-by-step explanation:
The Korean War broke out in 1950 when North Korean troops invaded South Korea. The United States and United Nations came to South Korea's aid. China later joined by sending troops to support North Korea.
The war became a back-and-forth conflict with neither side able to gain a decisive advantage. Fierce fighting continued for three years.
In 1953, the warring parties signed an armistice agreement to end the fighting and establish a demilitarized zone (DMZ) at the 38th parallel. However, a formal peace treaty was never signed.
The armistice essentially preserved the division of Korea into North and South that exists today. South Korea remains a democracy and capitalist economy while North Korea is a communist dictatorship.
Casualties were extremely high on both sides, but the Korean peninsula suffered the most with millions of civilian casualties and much of its infrastructure destroyed.
None of the major parties - North Korea, South Korea or China - achieved their military objectives. The United States and UN forces largely achieved their goal of preventing the communist takeover of South Korea.
To really just sum in up, the Korean War ended in a stalemate with an armistice agreement rather than a peace treaty or a clear victory by any side. The division of Korea remained, and the peninsula was left devastated.