(A) 10 – 20 (✔)
(B) 20 – 30 (X)
(C) 30 – 40 (X)
(D) 40 – 50 (X)
Answer: According to Big Bang Theory, the Universe began about 10 – 20 billion years ago.
According to Big Bang Theory, the Universe began about……….billion years ago.
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