May I please have help?
And we men, the creatures who inhabit this earth, must be to them at least as alien and lowly as are the monkeys and lemurs to us. The intellectual side of man already admits that life is an incessant struggle for existence, and it would seem that this too is the belief of the minds upon Mars. Their world is far gone in its cooling and this world is still crowded with life, but crowded only with what they regard as inferior animals. To carry warfare sunward is, indeed, their only escape from the destruction that, generation after generation, creeps upon them. Which of the following states the central idea of the second paragraph?

Humans were too proud to think that life could exist elsewhere.

Intelligent life has been continuously developing around the universe.

The end of the nineteenth century was lacking in intelligent life.

Writers did not write books about the inhabitants of Mars.