If I'm not wrong it's electric because without electricity many advancements wouldn't have been possible like for example; trains, light, radio etc; hoped it helped!
The correct answer here is A.
John Jacob Astor was born in 1763 to father who was a butcher so he was not very wealthy. He amassed his fortune by trading fur through that business he became one of the most wealthy people in the United States. Astor traded sandalwood, teas and of course fur with China which turned out very profitable for him.
Prior to 1497, most goods were transported from India and China to Europe over a land route, since no true sea route had been established. This was obviously far more costly and time-consuming. <span />
In the South it didn't stop some states from preventing the Blacks to vote
