Creating a fundamental shift in American foreign policy and establishing a “policy of containment” that framed our foreign policy as a battle between the forces of good (America and other democratic societies) and evil (the Soviet Union and other communist nations), was the 1947 Truman Doctrine.
This version is the most active and direct, starting with the agent of action (the Truman Doctrine) and clearly and concisely stating the effects of the doctrine. Choices A and C awkwardly put the action before the subject, and choice C also breaks up the two actions, interrupting the fluency of the sentence. Choice D uses two bulky which clauses, rather than the more concise parenthetical phrases of choice B. Choice E begins with a passive construction and is both wordy and redundant.