For the Following Question,refer to the Following Excerpt

For the following question,refer to the following excerpt. To ensure the peaceful development of nations,free from coercion,the United States has taken a leading part in establishing the United Nations.The United Nations is designed to make possible lasting freedom and independence for all its members.We shall not realize our objectives,however,unless we are willing to help free peoples to maintain their free institutions and their national integrity against aggressive movements that seek to impose upon them totalitarian regimes....
At the present moment in world history nearly every nation must choose between alternative ways of life.The choice is too often not a free one.
One way of life is based upon the will of the majority,and is distinguished by free institutions,representative government,free elections,guarantees of individual liberty,freedom of speech and religion,and freedom from political oppression.
The second way of life is based upon the will of a minority forcibly imposed upon the majority.It relies upon terror and oppression,a controlled press and radio,fixed elections,and the suppression of personal freedoms.
I believe that it must be the policy of the United States to support free peoples who are resisting attempted subjugation by armed minorities or by outside pressures.
I believe that we must assist free peoples to work out their own destinies in their own way.
I believe that our help should be primarily through economic and financial aid which is essential to economic stability and orderly political processes.
President Harry S.Truman,Address Before Joint Session of Congress,March 12,1947
The speech quoted above would be most useful to historians analyzing the

A) policies and methods designed to root out communists in the United States.
B) appropriate powers of the executive branch in conducting foreign policy.
C) attempts of the United States to defend a position of global leadership.
D) domestic opposition to the Korean and Vietnam wars.