Correct Answer: Edwin Hubble

Solution : The correct option is Edwin Hubble.

The concept of an expanding universe was primarily supported by the observations made by astronomer Edwin Hubble. In the 1920s, Hubble observed that galaxies were moving away from each other, and he formulated Hubble's law, which describes the relationship between a galaxy's distance and its velocity of recession. This discovery provided strong evidence for the idea that the universe is expanding.