Answer is (2) – Edwin Hubble.
Edwin Powell Hubble is an American astronomer who lived within 1889 – 1953 time period. He studied at university of Chicago.
He invented that the nebulae are galaxies and found the Hubble’s law which says the universe is expanding.
He suggested that galaxies are moving farther away and also suggested that the distance of a galaxy is proportional to its recessional speed.