Agalaxy that was once a quasar is likely to

a) have burned all its fuel by now and be dark.
b) now be a dwarf irregular.
c) have a black hole at its nucleus.
d) still be a quasar.
e) be less than 5 billion years old.

A galaxy that was once a quasar is likely to have a black hole at its nucleus.

C

Explanation:

Quasars are generally the most shinning object in space whose brightness is powered by the super massive black holes present at their center.

The quasars are generally young galaxies. The super massive black holes are surrounded by many gas and dust molecules which when entering into the black holes release radiations.

When the gas and dust molecules surrounding the accretion disc formed by friction gets emptied in the black hole, the galaxy stops being a quasar.

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