It is the 3rd one
explanation
White Army
The Western Democracies feared the communist revolutionaries in Russia; and supported the White Army in hopes of stopping the communist Red Army from taking control.
I think a or d but in hot 100 percent sure
<span>Manifest Destiny was a major influence on how the frontier developed. Manifest Destiny is the doctrine that our land was one that was destined to stretch from sea to shining sea. The reason that this was influential in the frontier's development is that when plans were being made, instead of slowly expanding outwards, the country exploded out living a middle frontier that was neither as developed as California or the East. </span>
<span>D.) economic competition with the Soviet Union</span>
