<span>Not only does the central engine of active galaxies and quasars require a black hole, Accretion disk of matter is also needed to provide the energy radiated.
</span>Dust, other stellar debris, and gas that has come near to a black hole<span> but fallen into it yet forms a flattened band of spinning matter around the event horizon called the </span>accretion disk<span> (or </span>disc<span>).</span>
12:00 pm... hope it helps
Preserve the environment.
Maybe that's it. Not quite sure
The answer is A; a natural source