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Answer: (A) George Lamaitre
Explanation
Georges Lemaître, a Belgian astronomer and Catholic priest, first proposed the Big Bang theory in 1927. He suggested that the universe originated from a single extremely dense and hot point, which he called the "hypothesis of the primeval atom" or the "Cosmic Egg," and that the universe has been continuously expanding ever since. He also derived the mathematical foundation for an expanding universe using Albert Einstein's theory of general relativity.