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Problem 9 - Olympiad

Arrange the following sentences to form a coherent paragraph. A) The Big Bang Theory is the prevailing cosmological model for the universe’s origin. B) Evidence such as cosmic microwave background radiation supports this model. C) Initially, the universe was an extremely hot and dense state. D) Over billions of years, it has expanded and cooled to its current state.

Correct: B

Introduce the theory (A), provide historical state (C), present evidence (B), and conclude with evolutionary outcome (D).