Which line from the text most clearly explains what made humans complacent in the last years of the nineteenth century?

a. early in the twentieth century came the great disillusionment
b. it is not only more distant from time's beginning but nearer its end
c. its physical condition is still largely a mystery
d. their assurance of their empire over matter

the war of the worlds
by h. g. wells [1898]
but who shall dwell in these worlds if they be
inhabited? …are we or they lords of the
world? …and how are all things made for man? -
kepler (quoted in the anatomy of melancholy)

book one: the coming of the martians
chapter one: the eve of the war, excerpt
no one would have believed in the last years of the nineteenth century that this world was being watched keenly and closely by intelligences greater than man's
and yet as mortal as his own; that as men busied themselves about their various concerns they were scrutinised and studied, perhaps almost as narrowly as a man with a
microscope might scrutinise the transient creatures that swarm and multiply in a drop of water.
with infinite complacency men went to and fro over this globe about their little affairs, serene in their assurance of their empire over matter.
it is possible that the infusoria under the microscope do the same. no one gave a thought to the older worlds of space as sources of human danger,
or thought of them only to dismiss the idea of life upon them as impossible or improbable. it is curious to recall some of the mental habits of those departed days.
at most terrestrial men fancied there might be other men upon mars, perhaps inferior to themselves and ready to welcome a missionary enterprise. yet across the gulf of
space, minds that are to our minds as ours are to those of the beasts that perish, intellects vast and cool and unsympathetic, regarded this earth with envious eyes,
and slowly and surely drew their plans against us. and early in the twentieth century came the great disillusionment.
yet so vain is man, and so blinded by his vanity, that no writer, up to the very end of the nineteenth century, expressed any idea that intelligent
life might have developed there far, or indeed at all, beyond its earthly level. nor was it generally understood that since mars is older than our earth,
with scarcely a quarter of the superficial area and remoter from the sun, it necessarily follows that it is not only more distant from time's beginning but nearer its end.
the secular cooling that must someday overtake our planet has already gone far indeed with our neighbour. its physical condition is still largely a
mystery, but we know now that even in its equatorial region the midday temperature barely approaches that of our coldest winter. its air is much more
attenuated than ours, its oceans have shrunk until they cover but a third of its surface, and as its slow seasons change huge snowcaps gather and melt
about either pole and periodically inundate its temperate zones. that last stage of exhaustion, which to us is still incredibly remote, has become a
present-day problem for the inhabitants of mars. the immediate pressure of necessity has brightened their intellects, enlarged their powers,
and hardened their hearts. and looking across space with instruments, and intelligences such as we have scarcely dreamed of, they see, at its
nearest distance only 35,000,000 of miles sunward of them, a morning star of hope, our own warmer planet, green with vegetation and grey with water,
with a cloudy atmosphere eloquent of fertility, with glimpses through its drifting cloud wisps of broad stretches of populous country and narrow,
navy-crowded seas.
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.