The South was partially based on slavery. They depended on slave labor.
Most did not live in cities, at least not until the early 1910's, which is why letter B is incorrect.
White southerners were actually mostly your typical American. Immigrants tended to go north and work in factories, as there was more work there and they couldn't afford land. This is why letter C is incorrect.
Most white southerners worked on small farms. Factories were mainly in the north while agricultural ties remained in the south (remember that!). This is why letter D is incorrect.
