Any process where material is removed with erasers or solvents to lighten a dark background is called continuous line contour
reductive technique

perspective technique
additive technique

Ithink that c would make the most amount of sense.

Studying history is very important so that we learn from past experiences and don't repeat the bad ideas/choices that might have been made. it can tell us how cultures conducted their lives and you can learn about interesting facts you might not know. hope this ! : )