The correct answer is D) A communist victory in one country could lead to the spread of communism to other countries.
The statement that best describes the domino theory is "A communist victory in one country could lead to the spread of communism to other countries."
During the Cold War years, the Domino Theory referred to the idea of the United States that one Cumminist nation could led to the spread of Communism in another neighboring nation, and another, like dominos that were aligned. That thinking led to the intervention of the United States Army in Vietnam. During these Cold Years, the Soviet Union wanted to spread Communist in many countries and the United States wanted to stop it.