5. Nebulae are large clouds of dust and gas that may eventually form stars and planets. Astronomers originally thought that the Andromeda Galaxy was a nebula until the nature of a galaxy was confirmed.
Which of the following shows the relationship between a galaxy and a nebula?

A. Many galaxies are found inside of a single nebula.
B. Entire galaxies are created from the gas and dust of a single nebula.
C. Many nebulae are found inside of a single galaxy.
D. Nebulae and galaxies combine to form stars.