The big bang theory states that the universe is (a. 14 trillion years old) (b. 14 million years old) (c. 14 thousand years old) (d.14 billion years old)

The correct answer is D. The Big Bang Theory states that the universe is approximately 14 billion years old.

The Big Bang theory is the predominant cosmological model for the oldest known periods of the universe and its subsequent large-scale evolution, which states that the universe was in a very high density and temperature state and then expanded. Modern measurements date this time approximately 13.8 billion years ago, which would therefore be the age of the universe.

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d is the best answer for this question.