Indoor electric lamps, telephones, electric steelcars, and automobiles.
B, C and D are all enlightenment ideas. They are enlightenment ideas, because they emphasize reason and scientific knowledge over religious theory and religious tradition. Diderot's Encyclopedia is a huge mile stone for the Enlightenment Period as it was a huge book of information so that it could educate the masses and there was a general idea during the time that all humans were equal and that elite monarchy and elitism in religion should not exist.
A. The emancipation proclamation stated from Lincoln that all slaves are free.
