Question

what kinds of objects lie in the arms & the disk of our galaxy?
emission & ionization nebulae
young o & b stars
old k & m stars
gas & dust
all of these

Explanation:

The arms and disk of our galaxy contain a variety of objects. Emission and ionization nebulae are regions of ionized gas. Young O and B stars are hot, massive stars that form in the disk and arms. Old K and M stars also exist there. Gas and dust are the raw - materials for star formation and are spread throughout the disk and arms.

Answer:

E. all of these