I'm going to say D because the artist would have had more of a chance to paint the people since they aren't moving as much, and in the other one, the painting would have to have alot of moving people, which would have been difficult, and I think that an artist wouldn't paint in the middle of a battlefield either.
Have no clue. I dont ever remember studying that.
Machine gun that is the answer i got on that question hope it helps
In the 1850s, new types of machinery being produced increasingly needed oil for lubrication. And the main sources for oil at the time, whaling and collecting oil from seeps, simply couldn't meet the demand. Someone had to find a way to reach into the ground and extract the oil.