Przepraszam, człowieku, nie rozumiem po polsku. XD Naprawdę nie wiem. Przepraszam.
Lincoln hated popular sovereignty because it was used to have power over slaves. It was intended to support the people from having their slaves and bringing them to different places that they wanted without any restrictions. It ties the slaves to an obligation of having a master. It was a confused principle used to justify slavery.
They were expensive to produce or they were saving up food to send to the soldiers fighting the war.
I'd say C because the other three wouldn't lead to it being the leading occupation, if anything, it would make it harder to conditions other than C