The Following Questions Refer to the Excerpt Below

The following questions refer to the excerpt below.
"[The Soviets will apply] insistent,unceasing pressure for penetration and command of key positions in administration…of foreign countries… In summary,we have here a political force committed fanatically to the belief that with US…it is desirable and necessary that the internal harmony of our society be disrupted… [and] the international authority of our state be broken,if Soviet power is to be secure… Much depends on health and vigor of our own society… Every courageous and incisive measure to solve internal problems of our own society… is a diplomatic victory over Moscow."
George Kennan,"The Long Telegram," 1946
-Which of the following explains the most significant challenge to the United States in light of the nature of the Soviet Union's policies as described by Kennan?

A) Shifting international alignments complicated the nation's commitment to containment.
B) Europe's war-ravaged economy left the United States in a position of significant power.
C) Domestic disputes over war policies threatened the authority of the national government.
D) Instability in the global economy upset the balance of power in the United States.