Although he could easily destroy a planet even without increasing his power rank due to a certain artifact he had created beforehand, Zayne wasn't that interested in it yet since it was too boring.
Except for the Type 3 Alien Civilization Invasion, the rest of the three options wouldn't increase his power rank.
However, he had already decided to "solve" doomsday scenarios rather than just survive in them.
Choice C, aka the Moonfall scenario, was basically the Earth's moon falling out of its orbit, causing it to fall towards the Earth.
It was quite similar to Dual Planet Collision, albeit much easier to deal with since it's the difference between moon-level and planet-level. Even so, Zayne wasn't certain if there were external forces that caused those doomsday scenarios.
After all, it was truly unlikely or almost impossible for the Moon to go out of orbit and fall on Earth. If there weren't an alien or something that caused this, Zayne wouldn't believe it.
