Aupmanyav
Be your own guru
Sure.Let us think together (if you don't mind) about the 4th answer.
The material world doesn't need to exist eternally for those who will deserve (a) or (b). But, from this perceptive, we can also see the material world as a temporary firm which was built by perfect spiritual entities to produce more perfect spiritual beings by allowing imperfect material beings (humans) to become perfect spiritual beings.
For (c), the material world (universe) is eternal in which all humans will end up being enlightened. I guess, since the number of humans, the revived ones from previous lives and the new ones, will be too big (going to infinity with time), humans will have to find out the ability to move from Earth and live on other planets as well. But this number can have an upper limit if the enlightened humans (who will reach perfection) are not supposed to breed anymore.
You see it that way, I don't. I do not believe in ANY spiritual entity. I belong to the 'C' category which is atheist.
For 'C', it is not essential for the universe to be eternal. It can and might have arisen from nothing and could go back to non-existence in flash of an eye (for all we know - Supernovas, Black holes).
Also for category 'C', it is not essential that every one will be enlightened in the end. Most (99.99%) will die in ignorance.
Category 'C' does not believe in rebirth, reincarnation. Even the enlightened live only once. And when one dies, nothing remains of him/her except dust.
For example, Buddha - nothing remains of him except ashes which were interred in eight memorials (Stupas).
Supernova, Black hole (Gravitational lensing), Piprahwa Buddha Stupa (500 BCE). There are enough cataclysmic events in the universe.
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