Which Concept Concerning the Diffuse Objects Observed by Herschel Was

Multiple Choice

Which concept concerning the diffuse objects observed by Herschel was proposed by Kant in the 1700s and further expounded by the Earl of Rosse based on observations made in 1845 with his world-class telescope in Ireland?

A) Many of the diffuse objects in Earth's sky are moving rapidly away from the Milky Way Galaxy.
B) Many of the nebulae in the sky are separate entities beyond the Milky Way Galaxy.
C) The diffuse objects observed by Herschel and known as planetary nebulae were in fact planets orbiting other stars in the Milky Way Galaxy.
D) All the diffuse nebulae seen in the sky are gas clouds in the Milky Way Galaxy.