Which option distinguishes the barn structure that would best compensate for lack of electricity?

a barn with no windows and a dirt floor
a barn with the windows facing the east
a barn with the windows facing the south
a barn with no windows and a concrete floorplan

Here are some adjectives for rome: gentle, belated, evangelical and universal, splendid and eternal, fourth and monstrous, eternal, never-to-be-forgotten, second or new, plebeian and imperial, pagan and pharisaical, still tragic and solemn, western or ancient, pagan or papal, hopeless, blasphemous, still tiresome and .