Slavery that led to the Civil War, or The War of the Brothers,
I would go with D. Things like gender/income/race do not affect how informed they are on issues or whether they are willing to speak oit at length, or if they are likely to vote in the next election. So D seems correct
A. Gold rush
Everyone believed California had TONS of gold which turned out to be false.
Both because you need both farm and and transportation
