Question

nearby quasars are rare because
o galaxies located relatively close to the milky way are not of the correct type and are not able to power a quasar.
o they can only be seen at great distances because they are very luminous.
o they existed during an earlier period of the universe and so today must be located at great distances.
o they only exist in galaxies that formed most recently and these galaxies are also located at the greatest distances.

Explanation:

Quasars are extremely luminous objects that were more common in the early - universe. As the universe has evolved, they are now located at great distances because they existed in an earlier cosmic epoch. Galaxies close to the Milky Way are not related to their rarity in terms of type for powering quasars. Their visibility is not the reason for their rarity nearby, and they do not exist in recently - formed galaxies.

Answer:

they existed during an earlier period of the Universe and so today must be located at great distances.