The correct answer is option 1: Edwin Hubble. Edwin Hubble was an American astronomer who provided the first evidence of the Big Bang theory. In the 1920s, Hubble made observations using the Hooker telescope at Mount Wilson Observatory in California. He studied galaxies outside of our Milky Way and observed that these galaxies were moving away from us at high speeds. This discovery led him to formulate Hubble`s Law, which states that the farther a galaxy is from us, the faster it is moving away.

Hubble`s observations supported the concept of an expanding universe, which formed the foundation for the Big Bang theory. The Big Bang theory suggests that the universe originated from a hot and dense initial state around 13.8 billion years ago. Hubble`s work provided strong evidence for the theory and revolutionized our understanding of the cosmos.

Albert Einstein, option 2, was a renowned physicist who developed the theory of general relativity but did not directly provide evidence for the Big Bang theory. S. Chandrasekhar, option 3, was an Indian-American astrophysicist who made significant contributions to our understanding of stars, but not specifically to the Big Bang theory. Stephen Hawking, option 4, was a notable theoretical physicist known for