Answer:
The correct answer is option D. "Some free-soilers opposed slavery for economic reasons".
Explanation:
The Free Soil Party was a political party in the United States which main purpose was to avoid that the slavery in the South would expand to the Western territories. Free-soilers opposed slavery but more than doing so for moral reasons they argued that it was better to employ the slaves to work the soils. Free-soilers believed that working the land was an economically superior system to slavery.
