Answer and Explanation:
In June 1950 communist North Korea invaded South Korea. The United States came to the aid of South Korea at the head of a United Nations force composed of more than a dozen countries. Communist China joined North Korea in the war in November 1950, unleashing a massive Chinese ground attack against American forces.
The correct answer is D. The government does all or at least helps with all of these things. This way the economy can function smoothly.
