The correct answer is A. Country D.
Explanation
Pictured is a map with the political division of the continents Africa, Asia, and Europe. In this map, four circles contain letters from A to D to indicate four countries. The letter A indicates Austria, the letter B indicates Syria, the letter C indicates the Philippines and the letter D indicates Vietnam. According to the above, it is possible to infer that the country that experienced a communist revolution was Vietnam (letter D) because the Vietnam War took place there, where the Communist Guerrilla of North Vietnam faced South Vietnam to impose communist rule throughout the country between 1955 and 1975. This war resulted in the imposition of communism in the Southeast Asian region under the influence of Vietnam. Therefore, the correct answer is A. Country D.
