The correct answer is C) Soviet failure to fulfill promises made during World War II conferences.
Truman's policy regarding Communism as outlined in the excerpt was a response to Soviet failure to fulfill promises made during World War II conferences.
In the excerpt, Truman mentions that "...the Government of the United States had made frequent protests against coercion and intimidation, in violating of the Yalta Agreement, in Poland, Romania, and Bulgaria."
President Truman continued: "The seeds of totalitarian regimes are nurtured by misery and want. They spread and grow in the evil soil of poverty and strife."
That was part of the Truman Doctrine speech delivered by President Harry S. Truman before Congress on March 12, 1947.