The Big Bang theory was propounded by:

Correct option is A

The correct answer is (a) George Lamaitre.
· Georges Lemaître, a Belgian Catholic priest, astronomer, and professor of physics, first proposed the theory of the expansion of the universe, which later became known as the Big Bang theory. In 1927, Lemaître published a paper where he proposed that the universe is expanding and that it could be traced back to a single point of origin, which he called the "primeval atom" or the "cosmic egg."

Information Booster:
· Al-Biruni: He was a Persian scholar and polymath who made significant contributions to various fields, including astronomy.
· Thomas Gold: He was an Austrian-born British astrophysicist known for his work in cosmology.