The country was controlling India (Raj) was Great Britian.
The answer i belive should be b
B. Opening up the eastern front
The long and costly Vietnam War with active U.S. involvement in it started in 1954 being intensified by the Cold War between the Soviet Union and the U.S. An ongoing conflict in this region had grown back several decades. During the Vietnam War, over 58,000 Americans out of 3 million people in total were killed during this war. The withdrawal of U.S. was ordered by President Richard Nixon in 1973. American withdrawal affected the unification of Vietnam as
the Socialist Republic of Vietnam.
References
History.com Staff. (2009). Vietnam War. Retrieved from
https://www.history.com/topics/vietnam-war/vietnam- war-history
