The answer that your looking for is c. "aquaculture." I hope this proves helpfull!
It was the battle of Gettysburg that was the most famous battle of the war and the battle after which the South started to decline. It caused the largest number of casualties of the entire war.
He was a founding father and spoke words of wisdom. He was also involved in the Treaty of Paris after the Revolution.
The distance between these two areas was somewhere around 3,000 miles.
This only makes their journey even more astonishing because they managed to walk across 3,000 miles while constantly being involved in battles. This is why it was said that his soldiers would be ready to march to the end of the world for him even though they stopped at one point.
Hope this helps! :)